Nisht- L’gabei cholent, there is a chashash that the guy is an apikores- since Karaites don’t eat any chamin on shabbos- but there’s no chashash that he’s a goy! And l’gabei shuckeling, how is that shayach at all to being jewish?
If anything, these are simanim, not sibos. It seems like there is more to the story…