The points values in the MM are from their new codexes, they've released the pdfs so that you're not playing without the codex but with points that make no sense when compared with their current units. For example, the MM will have the points for Rubrics with 2 Wounds, they would make no sense for the CURRENT codex.
Super simple, no gaslighting required
This could be true- but it isn't what they said in the article.
Also, why wouldn't they just leave points as is for now- rather than publishing a separate interim version?
Are we reading different articles?
"Well, we’ve got a confession to make – the points values featured in the Munitorum Field Manual MkII for the Thousand Sons and Grey Knights are actually incorrect. That’s because their codexes were intended to be out at this point, complete with their fancy new rules and updated points values"
The only changes in the points from the "interim" pdf in the article to GK and TS are to the landraiders, Storm raven and storm bolters on vehicles which is more than likely in line with all other codex equivalent changes