Bnei Torah who ate goyishe food?

This Sugya deals with Bishul Akum, which is a Chumra d’Rabanan to begin with. The Turmus in question were not included in the Gezeira (as you are no doubt aware, seeing as you have seen the Sugya). So they are not “Goyishe food”. The point that you are talking about is that those who are not Bnei Torah – meaning that they do not care enough to delve into the finer aspects of the Halachah – are likely to make broad general assumptions. If they hear that one thing is Mutar, they are likely to permit other things that are actually Assur. Therefore a Rav may not permit the Turmus – despite the fect that they are not even Asur mid’Rabanan – to Amei Ha’aretz, lest they then expand the Heter to include things that are actually Asur.
Rav Moshe Shternbuch Shlit”a recalls how in his youth the English city of Liverpool had a thriving religious community, but there was a big talmid chochom there who, noticing the difficult financial situation of the population, declared that he had found a way to keep stores open on Shabbos through a sale to a non-Jew. He publicized the wording of a deed of sale and partnership with a non-Jew, and people started opening their stores on Shabbos on the basis of that rov’s ruling. Unfortunately, within a short period, people started cooking and writing on Shabbos too, and stopped keeping Shabbos altogether. Once the fence of Shabbos observance had been breached, people no longer distinguished between different cases, and breached Shabbos completely, and they and their descendants threw off the yoke of observance completely. A flourishing Jewish community was destroyed because of that initial breach.

A fellow jew can be a frum yid but if he sins (cause he can’t hold himself in which means it’s considered on purpose) then he’s not considered a YOREI SHOMAYIM ( a person who fears Hashem) or as an example: he would hold himself back from eating that geshmacke but treife food and only eat kosher.

You could be learning full time in Kollel but if you come home from Kollel and your inside Neshama is still watching TV and the daily sports game then don’t fool yourself and consider yourself a BEN TORAH. Although you’re spending your entire day learning in Kollel, that’s all your outside guf body but what really makes a person who he is is his inside Neshama soul.
You could dress YESHIVISH or even chasidish but if your inside is a life of sports and TV then it’s all fake and also very bad for your children’s chinuch when they see and know that their YESHIVISH or chasidish parents spend their time on vacation and going out to restaurants etc. .. …..