In other words, it is a myth that all older publications are filled with false stories
No one has been saying that.
Let me say this.
The Making of Star Trek, for example, is filled with wonderful details about the production. It reprints important memos, a de Forest Research report, budgets, concept art, and other material of which the veracity is not in question. (I've seen many of the originals or mimeos of the originals at UCLA; they weren't touched up for the book.)
It also demonizes NBC, making false claims about the rejection of the Number One character (see the Solow & Justman book). It makes false claims about the show's international sales representatives (the book claims that they advised Roddenberry to make the show less diverse; Desilu memos indicate the exact opposite). It's positively skewed in Roddenberry's direction (witness the way it tells of the practical joke Gene played on John D.F. Black, and the way Black tells it in the Solow & Justman book).
This is not to say that the Solow & Justman book is beyond reproach, either. It gives an account of a deal made with a toy company that is likely incorrect. It makes claims about Grace Lee Whitney that the actress has disputed. It certainly tells a skewed version of Harlan Ellison's experience on the show.
Enterprise is a prequel. It contains a few retcons, but what Trek series doesn't.
ENT had in volume.
This is nonsense.
Enterprise was a problematic series with a few highs and too many lows, but it was no more incompatible with past episodes of the franchise than...well, any other installment of the franchise. Hell, the original was often all over the place in terms of continuity.
...and this from a person who--without a bit of evidence--argues that TMP was a "reimagining....
I'm not sure what the purpose of this debate is. "Re-imagine" was a marketing buzzword coined by Fox's publicity department in 2001 to avoid calling Tim Burton's version of
Planet of the Apes a remake.
The point about
Star Trek--The Motion Picture is that it threw out much of the original series (especially, but not limited to, its visual aesthetic) in favor of trying out something new. That it was still in continuity with the original series isn't something I see being objected to.