Shaman didn't think this through very well in several ways but land-Shogun is not an inherently bad strategy. I've done it myself once or twice. It looks like it did a reasonable amount of work to stabilise this game.

Granted I pushed less all-in on it but plenty of people contribute to winning plenty of ZK games with all-in strategies I would not personally pursue.

If the team had kicked him for doing stupid jank without their consent I don't think the admins would object to that action, but given that your own team had pretty minimal interest in kicking him I don't think the admins have a clear mandate to intervene.