I don't see why STers should have a problem with the team gauging DJ's value, or anyone else's tbh. There isn't a single player on the roster who's untradeable, it's exactly what they should be doing. Doesn't mean they're shopping anyone, it means they're picking up the phone and listening.
This is a smart thing to do because he'll technically be extension eligible. It doesn't mean they'll trade him for John Collins and a couple of late firsts, but considering the interest from a lot of teams they could get a godfather type offer. It also shows that despite of everyone knowing they're not going to tank, they also have different roads they might take in the offseason, one of which could be taking a step back and building around the younger core.