It's not a cop out. It's stating the obvious that we don't know what's going on in Wenger's head, we don't really know what's going on in the club.
Wenger doesn't seem to be content with us not winning. You can see in his reactions he's not content. Why he doesn't do more about that? There are plenty of possible reasons. I've suggested a few. The idea that it's because he's happy with how things are going is probably the least plausible. Not just because of his reactions when things aren't going well but also because, as you said yourself:
Especially a manager who has been used to winning trophies as he has. Are you suggesting that anyone who stays in a job or relationship when things don't seem to be going well is doing so because they're happy in that situation? There's no other possible explanation?every manager should want to do that.