Are the tombs carved out of a wall or flat rock?
Seems they're finding lots of stuff.
I thought they'd "radar mapped" ALL of Egypt underground long ago and so I searched and found this from ten years ago (2011):
Satellite Imagery Uncovers Up to 17 Lost Egyptian Pyramids By Heather PringleMay. 27, 2011 , 4:56 PM

Is this study the basis for all these new discoveries?
;-)
Asking for a friend ..
The technology improves all the time, plus, no, Egypt hasn't been radar mapped, probably Zahi "Zowie" Hawass blocked it because, imperialism, colonialism, Zionism.
These appear to be boxlike structures built of stones. Naqada phases have distinctions in the way they made (for example) their pottery, and what kinds of things they included in their burials. According to the wiki-wacky, the crania been found to be distinct from modern Niger-Congo specimens as well as Mesolithic Egyptians, but related to Bronze Age neighbors and some others much farther afield.