Makes sense to me. A big part of ADHD is object impermanence. That things you’re not interacting with are just not in your brain anymore. Since a lot of hoarding is getting multitudes of the same thing, way more than you could need object impermanence could play a roll in that. You might already have 10 can openers but your brain has erased them all, so you buy another.
Had a friend that had multiple hacksaws.
Asked why, he said I’m too lazy to look for the last one [his tool shed was crammed] so I just buy another whenever I need one.............