I cannot recall the Simpsons episode where Homer kills Bart. I suppose you could use the image to make a joke about cartoonishly strangling someone.
If Tan wasn't joking about wishing death on the people he listed then I have to wonder what exactly he was joking about. He wasn't the original author of the words in the tweet (a point that I think you're overly fixated on), but he chose them and knew what they meant. However, to me, the interesting question here isn't exactly what Garry Tan was thinking (I'm guessing the answer is "not much" – he was clearly off his head). It's how the CEO of YC is someone who could apparently take lessons in effective communication and good judgment from 14 year olds on TikTok.