I think the comparison to the the Gemara that we assume the person did Teshuva is amusing. 1 who says this is a Talmid Chochom? Most people aren’t. 2 Just having an unfiltered Iphone, which has been decried by all Gedolei Yisroel as leading to terrible nisyonos, is both an aveira, and a chilul Hashem (it makes such an act “acceptable” to society).
Probably the Rosh Yeshiva knew this fellow did not have a filter.
If all Roshei Yeshiva would follow his lead, it would help diminish one of today’s biggest nisyonos.