That’s a pretty grey area and weak at best. I’m not saying he was right to do so but “conspiring” to commit a crime isn’t illegal. If money changed hands then that would be a little stronger case but even then really he would have to sell the hunt and do it illegally for it to be an actual crime. Then you could look at it that he intentionally sold an illegal hunt in the US but the problem is still going to occur that the offense happened 17,000 miles away.
Except, it is in the Federal system. In fact if they cannot get you for anything else, they get you for conspiri