The point is that despite the likely suspension facing Watson, the Browns are trying to move Mayfield and it's all about getting the best deal they can. Hurts them that only the Panthers seem interested in actually trading for Mayfield, the rest are only interested if he gets cut and I highly doubt that happens. At the end the Browns will accept a trade offer, right now they aren't liking what is offered and so they continue to try to bargain for better terms, but before opening day the Browns will trade Mayfield, that seems like a no brainer to me.The Falcons traded Ryan for a 2023 third-round pick. They weren't on the outs with each other, it's just that Ryan wasn't their long-term future.
Mayfield is also obviously not the Browns long-term future. A fourth for Mayfield would be a reasonable return, but his contract is out of whack compared to Ryan's, and there aren't a lot of suitors.
The idea is to pay to facilitate a trade, not just to do anything they can to get him off their roster. They have the money to spend and they don't need to off-load salary for cap reasons. Paying part of a salary to trade a player isn't that uncommon. The Browns were playing at being hard-asses before and not paying any of the salary, as an initial negotiating position.
If the other teams think they can get Mayfield for free, the Browns' fall-back position would be to keep him and play him. If nothing else, they have to talk about that possibility at the bargaining table.
The main difference between Ryan and Mayfield is that there was no point in keeping Ryan around to go 7-10. The Browns are in position to do make a run this year if the QB play is adequate.