He's not wrong though. The tweet he's talking about is from the Associate Game Director for Diablo IV, so regardless of what you think about Asmongold, you still have a Blizzard employee giving the dumbest reason for why we can't have more inventory space. This is a problem that hundreds of live-service games handle better.

I’d rather you link a time stamp to the fireside talk where they talk about stash space

Maybe you should link it since you're already aware of the time. Personally, I feel like that tweet is a direct enough source for me.