Tasha's Cauldron introduces "group patrons".

Now, assume you only have the PHB and know nothing about what the term actually means as used in the book. What would you assume it to mean? Something warlock related of course.

It's not. It's a patron (in the old sense of the word) for the group of players.

There's no real attempt at thinking about understanding and comprehension of terms by selecting appropriate language. They've established "patron" as a game term exclusive to warlocks.

This is something I would expect the company to know not to do, because they're very careful and intentional about this on the MTG side. Its summed up in Mark Rosewater's "20 Years, 20 Lessons" GDC talk, also given here: https://magic.wizards.com/en/articles/archive/making-magic/twenty-years-twenty-lessons-part-1-2016-05-30

"Lesson #4: Make use of piggybacking "
They're doing the opposite - making it harder to at a glance know if a section of the book is relevant to the subject of Warlocks and Patrons.