It also wasn't a straight 'TWAW no debate', which Corbyn would have been pushing. Doubt he'd even have asked for an apology.
I am very disappointed, but I guess pp are right and Starmer wants to avoid the appearance of a purge.
If he is speaking with an eye to votes - and IMO, Labour could have done with a bit more of that these last five years - then good. Because all the evidence shows this is a massive vote-loser.