Now in our world that thing is definitely a scam but in a world with magic, it can probably do what it says it can. It's funny, if ever in the future another hero is summoned and he sees these items, he is gonna freak the fuck out lol
I love how he just casually makes a foot bath that "can only be destroyed by magic weapons" and should work for about 25 years.
The product he copied would probably only work for a few months.