This is bad reporting from phoronix (not surprising). The performance bug has nothing to do with FSR. It was just discovered in an FSR demo.

To be fair this satellite was built in 2016.

But keepassxc already provides a secret service ootb?

“If something is silenced, then that must mean it is right” is a pretty bad argument. There are genuinely good reasons to ban something. Being unnecessarily aggressive can be one.