2 different kinds of restructures. The one you’re seeing Dak do every year is a signing bonus conversion. Neither the player nor the agent needs to be informed before a team does it, as it doesn’t change their money in any way. It only affects how the team communicates their salary cap to the nfl
The other kind is really a rework of the contract in which the team reduces a player’s overall compensation. This is what happened to Demarcus Lawrence last year and is trying to be done to Zeke. It may be called a restructure, but it’s very different than what Zack Martin and Dak just did. It’s basically a completely new contract negotiation to replace the old one