I've climbed routes in ichinokura a few times. It is impressive, and some of them are quite poorly protected. But 800 climbers seems like an exceedingly high number, and that report seems quite vague and unsubstantiated, even if it does come from the government. So I remain sceptical.

Are you a professional climber? "Poorly protected" is ... not the word I'd use to describe those places.

https://4travel.jp/travelogue/11828856

I've only taken the tourist route of Tanigawa-dake. Those photos are scary enough that I won't try Ichinokura.