Excuse my ignorance, but could someone explain why that tween Elon agreed with recently is considered antisemetic?

Again, excuse my ignorance, I'm just curious since I don't really know the context and everything else I found has confused me. So I'm hoping someone might be able to explain it and give me much better context.

Article: https://www.axios.com/2023/11/16/elon-musk-antisemitic-claim-tesla-shares