I am an artist living close to the poverty line, I know absolutely nothing about how “business deductions” work. He still had ~$10.4k of cash or credit on hand all at once to turn into this pile of hardware, right? That sounds pretty real to me.

He mostly linked to manufacturer pages, I did not feel like spending the time to see if there were better deals out there. Feel free to spend an hour or so on that if you want to.