Damn, it's been almost a year since that shitshow. At this point it's safe to say two things - Byuu is alive, obviously and it's really unlikely that he did it to run from Ninutendoo.
Hear me out: imagine that they decided to jump on his ass, will they check official governmental sources, find out that he is alive (or missing, considering that his death isn't reported) and file a police report to bring his ass to court or they will google his name, see some sketchy news articles about his death and go "YOOOOOOOOOOOO"? I think, it's obvious that if he couldn't fool plain old spergs like us, he wouldn't be able to fool multibillion company and since then they didn't make a single move against him.
Also, faking ones death for real is REALLY hard, requires tons of money and resources and in the end there still will be people, who will try to reveal the truth.
If you don't believe me, watch this:
And this (timestamped):
So what the fuck was that? I think, it was way more simple - fellow furrydegens made fun of Byuu over his thread/visit to KF, he threw a bitchfit and bothered Null with "I have a rope and I am not afraid to hang myself" scene to get his thread deleted NOW NOW NOW NOW. When that didn't work, he threw another bitchfit with his public "suicide" hoping that KF will be killed in a matter of week, just like 8chan. When that didn't work and this bozo cooled off a little, he realized that coming back from the dead is not an option, since now this embarrassing shit will end up on the very website he tried to take down. And considering that his web presence has always been minimal, there was nothing to really lose for him. This is why all of this looks so rushed and overdramatic.
Something tells me, that he moved from Japan though, just to be sure that he wouldn't be discovered by some troon speedrunner on vacation to
Aokigahara Akihabara.