The WHO isn't really a combined organization. It's a diffuse set of disparate groups, panels, and NGOs. So they don't really have control over what any particular branch is doing.

IARC has been arguing that it's been doing its job under its defined parameters and I suppose they are. The problem is that, under their defined parameters, practically every single thing they investigate will be labeled as carcinogenic because everything is carcinogenic at a high enough dosage. Including being alive in the first place.

So I suppose the issue is more the media putting any stock or importance into IARC's announcements, when they aren't really saying anything meaningful about human health.