but I think antagonising the situation isn't going to help matters.
I'm genuinely interested why you think that's antagonising things. Surely he's simply laid out what is needed, and talked about consequences and plans, and that these things aren't going to change. I can see it as a warning, I can see it might be extremely unwelcome to those on the union side, but it seems to me it's simply stating openly what BA have been saying through letters and negotiation for months and nothing more. The one bit I guess could be viewed as antagonism is saying that Unite have only been in the negotiating room for 2.5 hours, but then it depends on whether it's true or not. If it is, and the judge's comments from the court case about previous rounds suggest that it's not unlikely, it seems all in all a statement of reality.