@noblegiraffe
I think they are forcing him into an either/or position on a policy/belief line that is lose-lose for him.
He and R L-B are the front-runners. So far, R L-B hasn't been able to find a policy line that clearly demarcated them: a line over which he cannot jump.
This is it.
He knows this is a massive no-no for the voters. But he also knows Many Labour activists are pro-trans rights as a matter of faith.
It's pretty much a boundary-defining belief, one that is a core identity thing.
So ... he's currently paying lip-service to agreeing - but not signing.
And I'm guessing he's hoping media will pull that pledge apart before he is pushed to sign by member expectation.
Not sure it'll work as a strategy.
We'll see.
Interestingly, though, quite neutral commentators are pointing out how crazy that pledge is.
It's the one silver lining: more light on this exposes how extreme it all is and gets it out to people who were previously oblivious.