You hit it on the head. This is just awful to scroll through and see replies heckling and disgusted by the situation pictured here.

I grew up with a parent that devolved into deeper and deeper hoarding tendencies and it was all due to deepening depression among other disorders. They were humiliated by it and tormented themselves with lying and desperate excuses when company would visit or neighbour's would comment. It took a lot of patience and help to get them to improve. Anything like what OP has done would have made me feel disgusted with myself more than the mess in the house.

Some things, as potentially juicy as they might be for karma or "emotional release", just need to stay in the family. I used to be humiliated by seizures I'd have as a kid and one day having one while a friend stayed over, I found out he told other people about how it and how ugly I looked and the silly things I said. It devastated me.

Some things don't need to be shared. God help the brother if he became aware of this. It's just not worth it.