Lern,
“Nefesh Hachayim made this point as well.”
I don’t think the Nefesh Hachayim (end of SH 4) is referring to this case, he is speaking as a general term. I will quote:
???? ?????. ?? ???? ????? ?????? ??????. ?? ?? ?? ??? ????? ??????. ???? ???? ??? ????? ?????. ????? ??? ???? ??? ????? ???? ?????. ??????? ??? ??? ?????? ??”? ??? ????? ??? ????? ????. ?????? ????? ????? ?’ ???? ????? ??????? ??? ??? ???? ?? ????? ???? ??? ??? ???? ????? ????? ??? ??”?. ?????? ???? ???? ???? ????? ??? ??? ????? ????? ????? ????? ??? ??? ???????. ?????? ???? ????? ????? ???? ????. ??? ????? ???? ?????? ?? ??? ???? ??????? ?????. ??’ ????. ???. ????? ????? ????:
“Rav Shwab famously said about the Satmar Rebbe that he would have accepted him as his rebbe if not for the zman krias shma thing which the Satmar Rebbe ignored”
Sorry, but you seem to confuse the two. No way did he “ignore” Zman KS. He davened after zman tefilah (Chatzos?) but he indeed did say KS at the earliest zman. Please name the source.
As for your claim that many miss Krias Shma, only total Am Haaratzim are not aware that about KS. In fact, most shuls including Chassidim have signs in large print reminding all about Zman KS!