Note: I have not read this manifesto. I think it would be a waste of time. In fact, I think I get the picture just from skimming the table of contents. Certainly seems like a whack job.
That said, I saw on reddit someone point out this paragraph from page 97 of his manifesto
source:
http://www.roydenhollander.com/main/Writings/CyclopediaUpdate2.20.19.pdf
So he doesn't self-identify as an MRA. He may have in the past, I'm not sure. He has worked with MRAs in the past (as mentioned earlier in the thread).