The Langobardi (Lombards) were living along the river Elbe, this pinpoints them better then any other geographical placename. Linguistically its nearest surviving relative like Bavarian dialect, belongs to the western Germanic languages. So it seems its population core was not of Eastern Germanic origin at all.
By the time we have concrete coordinates for the tribal population called lombards/langobards who move later into the north Italian settlements, they are living in the Carpathian Mountains in what would be today eastern Romania and western Ukraine.
What additions or substitutions they ethnically consist of at this point, during which they spend about 40 years as vassals to Huns, is impossible to say.
All the gothic and/or eastern germanic populations at this point have cooperated and conflicted with western germanic tribal populations that they have allied and fought with, sometimes both with the same tribes.
Its fully possible (but also speculation) that prior to this interaction the dialect of the Goths or Lombards could be eastern gothic / eastern germanic- which is pitifully documented because it is a destroyed and dispersed population- and that Western Germanic is later adopted as they rise to a level of a european power, **at least in its written form**, since this western germanic prevails in their new 'adopted' western homeland in Europe. The written forms may also be entirely the product of LITERATE western germanic speakers in their employ.
The underlying issue though is that no one has any sample of Gothic-cultural Y-results or Lombardic DNA, and while I would not suggest a automatic assumption that U-152 being such a large anomaly in their eventual adopted home region is the product of these eastern germanic populations,
I also see no valid reason not to suggest that this is probably the best probability for its anomalous elevated genetic presence in these specific lombardic/gothic settlement areas, at this point in time.
Germanic and Celtic are cultural not (in all cases) genetic determinants. The early Eu18 (R1b) and Eu7 (All Hg 'I') Eu19 (R1a) are in a way playing havoc with current SNP distros and more recent discoveries because in the early era when these had not yet been seperated into their current regional distros,
a early, simplistic and inaccurate application of ;
Eu18/(R1b)= Celtic
and Eu7 (All Hg 'I')= Germanic (this then included all I2 and dinaric since they have not been SNP typed)
Eu19 (R1a)= Slavic
This was neat, look simple and basically could be viewed to fit fairly well. The problem was, it started collapsing under the weight of further advances in population genetics.
We have never to this day found even one lone example of I1 on the entire european continent from any ancient sample, while all other Y-dna have been found on the european continent- We do find medieval I1 on the Scandinavian Penninsula in the burial of the leader of the Svears who established control over what is now Sweden, and who were ethnically distinct from Geatish southern populations.
We find plentiful Eu19/R1a all the way west to modern france 1,500 years before the slavic migrations west we have any record of. We also find significant G2a and I2 all the way to coastal france along with some R1b during this period.
For all we really know at this point, I1 is actually a Svearish Hg adopted culturally into the Geatish lands they eventually over-powered, instead of "the" Germanic Hg.
We now know after typing R1b-s21 that many germans are in s21, at least in modern populations as opposed to the potential migrating I1 Svears along the north sea Hanseatic coastal regions.
We now know that R1b, R1a, I2, and G2 Y-dna can be found in Western European populations' ancient remains in the Bronze age, on the verge of these celtic and germanic cultures very beginnings or possibly even before they existed culturally.
All that said, with a anomaly that is so obvious in a small and precise region long in the settlement and control of a population to the degree that it actually left its tribal name on the area to this very day, I think that its scientific malpractice not to suggest that U-152 must be at least investigated as the result of gothic, lombardic, or other eastern germanics settling in the area.
NOT doing so because back in 1999 at the advent of Y-dna testing, when everyone in the entire R1b Hg were all described as 'celts', and no one had any sort of SNP's at all beyond M-269,
which led everyone at that time to make up their minds and it now requires a lot of revision of what were once firmly held beliefs that often affect peoples assumptions about their own Y-results,...
is not a valid or sound stand to oppose such a rational examination in this case.