Do you mean the general public think it's a bit of a laugh, or the hoarders themselves think that?
The general public.
They laugh.
But then tend to turn around do a good line in shocked revulsion along the lines of "why didn't you DO something to help him/her" when they close enough to a real hoard to really take in, breath in and smell, what a home looks like when it's been swallowed by a hoard.
Purple
You are standing on the edge of a precipice. The problem is, you won't be able to recognise it as that on the way down, not until you hit the bottom. None of us do. The true view of the scale of the mental health issues, represented in stuff, can only be had when you are down there. Once you've had years of the same circular arguments, threats, promises half kept and then steam rollered over.
He made room. When you are still up top, it looks like room to throw down a line and pull him up from under a problem he'll be able to manage and control, with your help. But it's not. It is room for you to fall down there too.
You need to run. You probably won't. Part of why this sucks is because those of us who have BTDT are as willing to help you as you are to help him. And typically we are about as successful at coaxing people away from the edge, as you will be at getting him to deal with the root causes of his hoarding, with a view to bringing it to an end.
When he made space you saw movement in the right direction. We see textbook churning. Not cos we are clever, or special experts. Just cos we've seen it so very many times before. From the bottom, rather the edge you are teetering on. It's just a matter of angle. And lost years spent watching love and a loved one choke to death on dust, crumpled receipts and something buried and sharp that caused yet another minor injury.