No need for piracy. Since they gave him a refund, he could just buy a copy.

If they refused to refund his money, then... yeah, it does make you want to hoist the black flag, doesn't it?

There is actually no legally available English version of this ebook now, so if you want the ebook piracy is the only option. Presumably Amazon still has the rights to sell it, but due to a technical glitch and disinterest, they aren't.

Since he already owns a copy, I don't think he can buy another, unless it's a physical book.