Per the wikipedia page it states that it is not clear if it effective because they're not going to intentionally infect the children to test it. But we see the results specifically on the targeted gene. That's a success and demonstrates the technology works.
I'd argue the folly was inserting an artificial gene as opposed to the natural gene that we already know works. Either way the technology showed expression on the correct gene, that is a success.
We'd be having a better discourse on this if his results weren't banned from every journal and not studied.
So far I'm liking lemmy more because there is a lot less per post. I find I'm enjoying each thread more fully. It's like I'm not endless scrolling because I can't. I've actually read more articles in the day since I've joined than in my last 3 months on reddit.