He does make it harder than it needs to be. He's basically just advocating for caution with SSI. Here are some good quotes:
Discussion
Is my nostr keypair an SSI? Do I need to be cautious of something I'm unaware of?
SSI comes from the web3 world, and yeah, I think it's the same idea. I wrote about this a while ago in nostr terms: https://habla.news/u/hodlbod@coracle.social/1687802006398