His position and presentation are quite compelling, but perhaps are not the whole story.
Alex Hutchinson points out some of the concerns about the research :
The Sock Doc also has just written a post closely examining O'Keefe's argument and the way in which it has been popularised. Definitely worth reading:
Remember: Always health first, fitness second. So train smart and train hard when you can and you’re ready to do so. Training hard is good for you, but do not do such extreme training too often. I love training hard, but I am intentional about it and only when my health is optimal and my movement is efficient
I think possibly we are all on the same side here, just misunderstanding each other a bit.