Don't know about IMG hoops. But it's still not high school, it's club. I didn't argue that school teams can't beat club teams, and especially in hoops where one player can mean a world of difference.
I'm saying they're two different things. And that doesn't even mean they shouldn't scrimmage or play, just shouldn't play a game that matters.
When I played pop Warner we had an annual "bowl" game before our real season started against a program in YFL or some other league. Their weight requirements were different than Pop Warners so we were always matched up against bigger teams, not by the luck of the draw but by rule. It was okay to play the game, the game just didn't count. We won some and lost some.