At the end of the day this person's argument is "WASI providing posix like APIs to WebAssembly is harmful for the web" and they are very angry the larger community disagrees with them. Despite all the diagrams, words, and tables repeating "In Violation" the author can't make an argument more substantiated than their own opinion of what's appropriate for the web.

It's also clear this person would be extremely unpleasant to collaborate with. So none of this is surprising.