Self medicating is its caption, cartoon-Trump is stressed about the virus and how to respond to it. So he copes by bingeing/ self-medicating on products he is viewed to have endorsed or has some ties to.
Lysol, bleach, hydroxychloroquine come from remarks in his covid speeches, Fox is on the television because he's stated that he watches it for hours daily. McDonalds comes from his White House meal spread for a football(?) team, and I guess KFC is in there because they're known for an anti-gay sentiment? No clue on his connection to Diet Coke.
The punch line is by no means clever or new, but it's there.