I don't think it's lost. You used a (known) scam site to create a paper wallet. The site owner most likely has access, but it looks like he's just HODLing your coins. He's probably not in a rush to cash out, which might compromise his own identity (and get him caught).

Have you reported the theft to your local police, as suggested before? If they ever take down the owner of the site, it might be useful to have a paper trail.