@yankel-berel
i didn’t see anywhere that the Steipler says that NK are mistaken. Nonetheless, if the Steipler DID claim that NK are mistaken he would INDEED be claiming that their approach is kefira in the the true Torah.
[This is true of every machlokes and shikel daas as explained in Pikei Uvos about michlokes leshma and as Rashi ended his incredible commentary this week with “ashrei sh’hibarta” which later commentators explain that the breaking of the lichos by Moshe gave us our current status of Torah Shebaal Peh that leaves the 50th gate of understanding inaccessible until Moshaich comes, when the final right and wrong will be revealed]
Once again, in your eagerness to mock Torah and our past Gedolim you confuse “kefira” and “kofer”. A “kofer” is someone who is taught that a certain idea is “kefira”, yet choosing to foolishly believe it.
If the Steipler is correct, NK might be believing in kefira, but the Steipler is not claiming they are expected to understand that. So too the reverse, if NK is indeed correct it would seem the Steipler was believing in kefira.
[This is all – perhaps foolishly – presuming a binary choice between the two]