That's a great MO thread. It's amazing what the pros do.
What tiny little I gather is that Mochizuki has been working for years on some kind of new "next level up" kind of abstraction that nobody understands. And people know he's not a crank because he has been producing important results as he goes. But now that he's announced a solution to this really important problem, the rest of the number theorists have to not only read his 500 page paper; but they also have to come up to speed on the strange and revolutionary math he's been creating over the past decade.