CrazyOldCatMan@,
It is not rubbish !!!
Been there and seen it from both sides also.
US companies still like to play their 'games' and will do things like this.
Usually, the pay-off is slightly increased with a NDA to top it off !!!
There is a threat of legal action if you fight it.
The intention is that you cannot afford to fight as long as the company can !!!
You tend to get an early warning when your Yearly review scores are randomly lowered because your manager has to have a more even distribution to have ALL the reviews accepted ..... and other 'alternative facts' !!! :)
Don't believe, blindly, that the Employment laws will protect you ...... there are lots of ways to 'game' them.