I do agree that if they're saying the side effects aren't listed, they're lying. I don't believe it lists all of them, nor the severity of the ones that are listed. I have too many friends, acquaintances, and family members who have suffered side-effects far worse than what the CDC, WHO, and the NIH have listed.
I'm not totally anti-vax...but I am when they haven't been RIGOROUSLY tested by a third party...companies will lie to promote their product if they have the chance and won't give the full details. This has been proven time and time again with companies like J&J, pfizer and others. Moderna apparently hadn't ever made a vaccine before this, and that's a HUGE reason not to trust them.