It did strike me that it was interesting that what they were essentially arguing about was how much access to woman's spaces/ rights/ services etc should transwomen have (and more existentially, what a transwoman IS) - and yet, no one in the room was a transwoman.
The NB was clearly committed, put their point across well and was sympathetic (though I felt disingenuous) but was (to me) clearly female in appearance (though androgynous in presentation)
It did seem odd for the argument not to presented by the intended beneficiary rather than a proxy ..
(appreciate NB is under the Stonewall trans umbrella but politically they are not really 'disruptive' in the way that people wanting to be accepted as the opposite are as they fit clearly into existing categories)