That’s the bonus to sign with the team, how the league attributes it to the cap and how the player sees it in relation to their yearly pay are two different things. Players don’t see their bonus as part of their salary.
It's still money though - that's why it's part of the salary cap calculation and it's definitely part of every contract negotiation. How much is salary and how much is signing bonus is just games they play for cap purposes. Speaking of the cap, check where Judon currently sits on the Patriots salary cap. Here are the top 10 Patriots salaries for 2024:
Basically, a soon to be 32 year old player who sat out most of last year with a serious injury that could affect his performance & makes the most salary on the team wants a raise. I wonder why the Patriots are balking?