Just found this:
and someone in the comments on that page quoted:
As it stands, currently the only phones that don’t use RNDIS and instead use CDC NCM are the Pixel 6 and 7 lines of phones.
On the other hand, we know that the L5, being a labor of love, has been designed to embrace modern features wherever feasible, so suggesting that it depends on such a legacy interface like RNDIS would strike me as very odd and out of character for the L5. Searching this forum for CDC NCM
yields a few results that seem to indicate that it supports the latter, but no conclusive answer.
So, is the Great RNDIS Purge going to affect the Librem 5, or not?