Maybe. I see a lot of whistling past the graveyard here in tech world. Design is a critical and nuanced world, but if an LLM can get you 80% or even 50% there it's a time (and possibly resource) saver.
This is not to wave away the other things it can do like generating copy.
The strength of this offering is that it is seamless with the experience Wix is based on.
I think the role of AI generated site is to help getting a better result fast, both for non professionals, but also for professionals as a starting point.