Pretty unlikely.
The way the kernel devs seem to be using LLMs isn't really going to lead to any bugs that wound't have snuck in anyways.
I'm not a tech bro or AI apologist. I'm choosing to skeptically trust Linus in this case. Based on my understanding of how it's being used, I don't think we have a lot to worry about.
That being said I wish he would STFU about it because the "Linus is pro-AI now guys" headlines are not doing the world any favors.