I think before LGM, the Nile valley was populated by Hap E, and E-M35 was in the Nile delta. Their subsistence was quite diverse, with meat, fish and plant food (Khormusan industry).
During LGM they got microlith technology, probably also bow and arrow, Basal Eurasian and mtDNA U6 and M1, all from Hap H2 in the Levant. They didn't get SSA, as the whole Nilevalley was Hap E. With their new technology, from the Nile delta they radiated into the Levant (Natufian), along the North African coast (Iberomaurisian) and upstream the Nile (Halfan and later Qadan), and maybe Berber (E-M81) stayed in the Nile delta for a while (maybe they were Capsian industry which appeared ca 12 ka).
I checked the Y-calls for Tarofalt from Genetiker.
https://genetiker.wordpress.com/2018/03/18/y-snp-calls-from-the-iberomaurusian-culture/
I estimate TAF009 split from the main E-M78 branch ca 18.5 ka, and TAF010-015 split from the M78 branch ca 15 - 15.1 ka.
TAF010-015 are dated ca 14.55 ka, so they split from M78 some 500 years before their burial in the Grotte des Pigeons.
My guess is they arrived from the east, maybe Tamar Hat or Haua Fteah in Cyrenaica after their split from E-M78, without SSA, and they got SSA maybe in Tarofalt.
Then there would have been a backmigration of the main E-M78 branch from Tamar Hat or Haua Fteah to the Levant, before the TMRCA of E-M78 which is 13.4 ka.
I realise this is a rather complicated story, but it is still the simplest story I can figure out.
So I intend to stick to that story till new elements appear.
As for the Nile Valley and the Nile delta it got filled up with thick layers of sediment (50 meters and more) between LGM and the youngest dryas.
It will be hard to find anything there, but Qadan culture was found in the adjacent wadis.