I doubt that is a Unite website - the url might be UniteBA but despite the Unite and BA logo, all the contacts are Amicus \ CC89 (and there is an Amicus logo up there as well).
The content seems sadly reminiscent of a teenage tantrum where common sense has gone out of the window in favour of blaming everyone \ anyone for their own predicament.
Ultimately, I'd expect a "No" vote to the agreement and then the ball is in Unites court (could be quite literally). Do they call for further IA which all but the most blinkered know will fail? Or do they just ignore it and hope (like BA) that BASSA will gradually fade away?