"The 2023 salary cap for all GS employees is $183,500 per year. You cannot be offered more than this under any circumstance."
There’s no negotiation though, either the billet is part of the program (CISA calls their CTMS) or it’s not, and either you check the box (usually with a certification) or you don’t.
Edit: found this on their site.
Absolutely wild and shortsighted.