I mean, this is a judgment, from a judge. Isn't he making a decision by definition? In this case (I assume) Deliveroo argues that it is not a delivery company

I mean, this is a judgment, from a judge. Isn't he making a decision by definition? In this case (I assume) Deliveroo argues that it is not a delivery company and so isn't part of the collective labour agreement, and complainants claimed that it was and that it is. The judge decides that Deliveroo quacks and walks sufficiently like a duck to be considered one. I don't see why "this seemingly doesn't require decision making at all". It was the entire thing the parties disagreed about.