So how exactly did he get hired by Bloomberg?
Are you seriously asking why?
Because he has so much connections through industry that he is able to break stories that other people can't. And they are trying. Rebekah Valentine from IGN is trying to walk similar path but he is way ahead.
He has written exposes on development of Destiny, TLOU 2, Cyberpunk 2077, Halo Infinite etc.
He was able to publish information first about megaton infos like Microsoft buying Bethesda and ABK, Jim Ryan leaving, todays layoffs at Epic Games etc.
There is a reason why people said "So, I don't need to visit Kotaku anymore" when he left for Bloomberg.
I mean. He is a dick to people. Especially when you don't agree with his views on certain things (unions especially). But he is damn good reporter.
And for blocking people on Twitter. It's his profile. He can do with it whatever he wants. Hell. Kamiya decided that he wants to block everybody who is replying in English. Josh Sawyer (Obsidian) is blocking people with blue checkmarks. It's their right to do whatever they want. You have no "right" to follow him if he does not want to.