I agree the kernel devs appear to think they can outsmart the LLM slop problem.
But unless they were able to suddenly get way faster at reviews without a quality drop, which I doubt they did, this indicates it's not working out: https://www.neowin.net/news/linus-torvalds-declares-massive-ai-fueled-code-surges-as-the-new-normal-for-linux/
As far as I could tell, no specific cases of plagiarized code in the kernel were cited.
You should look at the studies for that. Given the rate of it, in my opinion it seems like the question is rather where these plagiarized items are not whether they exist.