How many times does this need to be said?
No changes in terms or conditions of the lease. The tenant does not have to accept anything new (and it might not even be legal).
A percentage decrease means it is NOT a PR, which sets a lower amount as a defined dollar amount. No matter how you want to argue it (Bubba), a percentage is not a PR.
Anything you sign - other than the renewal lease - has the potential of being used against your interests. Don't do it.
Some tenant lawyers will say things like a lead paint notice is inconsequential, so there's no downside in signing something like that. I would not agree with that, but still, the rider in question here seeks to bind you to new terms.
So please, unless there's new information that is material, please let this thread fade away (SR77, you do have a way of dragging threads out forever).