The joke has nothing to do with Ed’s body. The image is a joke referring to the fact that all of Ed’s songs use cowboy chords played on the first three frets. Therefore, he doesn’t need additional frets.
Edit: softened my tone to match the softened tone of OP. The people below writing paragraphs about it need to go touch grass (or read theory).
Ps. Telling someone to “do better” while also being flat out wrong has to be the most cringey thing that could happen in a thread and I couldn’t resist wagging my finger right back at the finger-waggy OP. Sue me.