OK, seems refund policy change after last time I was declined by the support. So the potential danger would be the seller account which passed 3 months can sell something that buyer can't ask refund from itch.io support but the seller.
For the second issue, there are so many reasons that the seller https://tsopic.itch.io/ could have no prove to sell these games.
1. As the seller mention, these games are from Finnish game brand PocketPlayCard Game, and I detected that the company is no longer working, the official website is shut down, and you can check the other information of this company in the E3 2001 Guide book.
https://ia801900.us.archive.org/20/items/E32001Guide/E32001Guide.pdf
2. the seller only uploaded some casual photos to sell them that it looks like the seller didn't have official product print.
3. the seller used the masked email but not their official email (@plastcenter.fi) which makes me sceptical for what kind of reason the seller didn't want to be found.
4. the seller uploaded them and made a bundle for sale, then just disappeared.
All of these itch.io can't give a explanation too, so why don't itch.io close down the page for clarification. You don't have enough information to believe that the person illegally distributing the games but you also don't have enough information to believe that the person can be legally distributing the games. If there is any misunderstanding, I believe when the seller notice the store page is closed, he/she would come up right away to explain for necessary.