I somehow ran across this trivia twice today. It stings; Pyrex was a brand I still trusted.
The other thread mentioned that they license rights to use "pyrex" (vs "Pyrex") to pretty much anyone, but the capital-P brand should still be the OG company. Maybe that was relevant in your case.
At this point I don't trust it if it doesn't at least explictly claim to be made with borosilicates. There are such suspicious items for sale on Amazon and I trust them more than "pyrex."
The other thread mentioned that they license rights to use "pyrex" (vs "Pyrex") to pretty much anyone, but the capital-P brand should still be the OG company. Maybe that was relevant in your case.