He did the entire 500-page paper in isolation and refuses to lecture on it in any capacity anywhere other than his own university. He may be right, and he may not be, but his failure to get an answer from the community is his fault, not theirs.
Minhyong Kim (cited from the article) makes a good point: that "any journal would probably require independent reviewers who have not studied under Mochizuki to verify the proof."
Given that, Mochizuki is stuck between a rock and a hard place - anyone he brings up to speed automatically becomes disqualified to independently review his work.
While you're correct, part of the fix for that is not to publish a 500-page paper in isolation. You instead publish the underlying concepts piecemeal in "easy"-to-understand chunks (for this insane level of "easy", hence the quotes). This works the same as how good practice when writing code is not to drop a 50 ksloc commit, but rather to do a series of patches showing how you arrived at a given solution.
My friends and I occasionally joke that the worse a professor's/programmer's/scientist's personal university webpage, the better they are at their actual profession.
It's not the worse mathematician homepage I've seen, by a grand margin. Mine is only marginally better, and I have more to blame since I know what I do when I do webpages :)
When I was in academia, I just used Word (and "Export to HTML") to create my university homepage. Even back then, I knew it was ugly as sin, but I had other things to worry about.
I still don't have a very good sense of design, but I can use Bootstrap. That's good enough.
did you look at the source, that was written by a mathematician, he took careful care to calculate out every pixel of padding and space. Probably for his specific monitor :)
