yitayningwut has previously identified himself as a student of Rav Abadi.
Rav Abadi is a tremendous baki in kashrus both in halacha and “metzius” i.e. the facts about various ingredients including chemicals, where and how they’re processed etc. He is also a major proponent of people educating themselves to be able to shop in exactly the way yitayningwut describes. Obviously, someone who does not eat pas palter or chalav stam cannot shop this way.