There's propaganda slogans/posters like this all over the Meta offices. One of them is "This is now your company". When the layoffs started happening, I started seeing these mocked, "This is no longer your company", etc.
The whole 2+ years I was there (left because of 3-days RTO), I felt like it was a cult and some people seem to drink the kool-aid (or they are good at pretending to like the culture), but some like me, who are more skeptical, don't.
Anyone who can't grok the doc in 30 mins is unlikely to ever open it, and if they do and spend a few hours on it, chances are they don't have much to add and it only served to educate themselves.
Instead, you give it your best shot, surrounded by others which helps to focus/eliminate distraction and then get to listen to someone with far more depth critique it - and you get to learn their framing and about a ton of nuance you would never have taken away otherwise.
I'm sure they knew this was propaganda. The little red book is a very clear reference (just do a search for "little red book" if anyone doesn't recognize the reference).
A large percentage of programmers of a certain generation got their start in the graphic design world.