We are going to see more of this with LLMs being able to uncover hundreds of bugs in projects just like Linux.
Given that Linux allows the use of AI assistance [0] you'll be very disappointed to see that people will use LLMs to find even more CVEs and bugs much quicker. That also means they will be fixed much quicker which should be a good thing; as long as the core developer is in the loop checking.
Unless you are against or downplaying this, you may not know that you are actually coping.
You are right, its over.
On a more serious note. Yes and no. The kernel is secure. It is probably the most scrutinized piece of software in existence. LLMs will find things but most probably they just will help contributors fix bugs.