People are so used to getting gaslit by megacorps, they just eat that shit up unquestioned

Because they want to plant that seed of doubt and fear.

Might not work for you, but unfortunately there are a lot of naive or insecure folks out there.

I do feel like this is smart. The first two points are whatever but the third one "typically you must go through union instead of your supervisor or manager" makes it sound like there is a lot of bureaucratic overhead to it. People who are undecided could feel that it's too much effort.

If you can think critically, sure. But large amounts of the population are dumb as bricks and will believe this literally just because it's on a poster.