Yeah, its kinda funny but apparently the reason they made it and their channel name unsearchable is because they kinda just wanted to upload without worrying about becoming popular so they kinda asked people not to talk about it.
At least that's my understanding, unfortunately I couldn't talk to them directly since I don't know japanese and also they wouldn't respond if I did.
Yeah, I heard about it, even there was that "welcome to the cult" thing when it first came out.
I heard that this joke went too far as I don't know what happened.
And please, do not fill the reason why.