He's rightfully banned.
I understand they plan on releasing a rework soon for him so they probably are reluctant to touch him right now, but they honestly saw this level of bs coming before they released the jungle rework. They state in the patch notes that ww has a better clear speed, safety, and consistency than almost any other jungler out there in the new jungle, yet they only hit his ult timer, and even then by 20 seconds. Combined with all the on-hit benefits they've created, alongside the inability to cancel ww ult damage and onhit procs even by ccing him mid ult, means that it's a huge ball of true damage, magic damage, and physical damage numbers being thrown at a target with no mitigation or counter play. It doesn't matter if it happens 20 seconds less often, when it does happen now it's basically a free kill regardless of whether an ally helps or not.
Meanwhile, they hit mumu with an armor and w nerf in the exact same patch, completely ignoring the sustain meta that was already forming in the pbe for the new jungle, because "his clear time would be too fast" ignoring the fact that he gets wasted in the new jungle, even with his slightly fast clear time.
They completely missed the mark on what the meta would be, and now there's a patch of unbalance to deal with.