This is a text-book example of blowing this out of proportion. And while yes, you can technically sue anyone for anything in the good ole US of A, it would be immediately dismissed.
You're fine, don't blow this out of proportion! Everything is ok. If your ECU was tunable, it's still tunable. Depending on your ECU date, it's possible that nothing has changed at all.
* Early 2020 Supras could be tuned without a bench unlock.
* Later 2020s and early 2021s needed a bench...
If you're referring to the sport gauges.. Heaven help you. Why would anyone pay for dyno time if the car could just tell you?
The sport gauges are just a silly show for your passengers, a gimmick. They basically display a 0-100 value scaled to be at 100 when max torque calculation is reached...