It’s a funny joke but probably kind of true. I see this contract as one that is intended to carry him through his final playing years and then into coaching. Many people will tell you Hoyer has said he doesn’t want to coach, but it’s not accurate - he said he felt it would be irresponsible (rather, his wife would be mad at him) to have to put in more hours as a coach for less money than if he was still on the roster. I can see this being an agreement between Bill and Hoyer where Bill says “I’ll pay you good backup QB money for two more years, but you’ll have to do some extra work coaching up Mac and any other potential QB I draft and working with the offense, then after this you’re my QB coach in 2024.” Hoyer turns 37 this season so I don’t think he will get a ton of offers at age 39. I’m sure he will be ready to hang them up by then, and coaching is the obvious next career step.
Honestly Hoyer could be the psuedo-assistant OC if Bill really does intend to run the offense this year.