Jer
A window to the west, a blazing star above
Because it's a reminder that he's a normal human being like the rest of us, and most of us can directly relate to packing on a "quarantine 15" (or 30), so the laugh is about the fact that even our heroes aren't immune to the same struggles we all face. Or maybe we're all just abject assholes obsessed with schadenfreude instead. I'll leave that determination as an exercise for the reader.Dave, the handsomest man on the planet in the early '80's, has aged more visibly than any of his bandmates and the last two years have been particularly unkind to him. I'm just curious to know why anyone would find that amusing?
Also, one could repurpose your argument about Dave's looks to try to claim that this isn't funny:
Hopefully that helps.