"no serious text can get around scientific fact just to present and position their own product. (The faculty, after all, have to approve the referenced texts, and precious few of them desire to be perceived as corporate shills.)"
So you've either never been to college or you simply accepted what was put in front of you... more proof that higher education in America is going more towards the "teaching people WHAT to think" instead of "teaching people HOW to think."
Most of the faculty would never purposely be corporate shills, but they will easily perpetuate "facts" that are "accepted" even if not true. Eggs are good for you. No, they're not. Yes, they are. etc. Pick almost any topic and you'll see a pendulum both in the "facts" and what is taught.