Most of the E-L241 in Albanians aren't associated with Slavs actually from what I know, such as Berisha e Kuqe has nothing to do with Slavs etc. nor do I see how this was taken by Albanians later , should see matches that show that then but quite the opposite. Also good part of Kosovo Serbs are Montenigrins from Montenigrin tribes that have Albanian origin so not sure why you would be surprised of an Albanian affiliation , even before the full tribal formations biggest non-Slavic population in Kosovo were in fact Albanians and Vlachs also.
I do know that there are Albanian branches in Serbs and quite obviously there are more of them in Montenegrines and Kosovo Serbs, that's just logical. I'm only asking for the evidence, for the data on which these conclusions are based upon.
Many of the branches you quoted are not necessarily Albanian derived - at that resolution. Some are, whereas others are clearly Slavo-Germanic derived, like e.g. https://www.yfull.com/tree/E-A783/
And that's an actual, NGS tested Serb from Kosovo.
I know about the Vlachs, but if writing about Albanian derived, Vlachs are a different group of people. I think the Vlach influence on Serbs as a whole is greater than the Albanian influence.
Concerning E-L241, it clearly is, if having non-Albanian origins in part, I mean the minor Albanian branches, not the major founder lineage, rather coming from Vlachs than Slavs, but difficult to tell without further testing.