I don't particularly trust Streeting, but he's been staking out a relatively reality-based position, even if it's just because he's one of the few Shadow Cabinet bods who can read an opinion poll.
This strengthens his position, and it's given cover to Cooper to also come out with a relatively sane position, though they both have to couch it in terms of "culture wars" and "toxic debate". This appeals to the section of Labour that loves to have the authority of an independent report.
Would I like to have grovelling mea culpas? Absolutely, but the nature of politics means we won't get them. What might be possible for Streeting or Cooper would be to say something along the lines of "we went into this with the best of intentions, but the issue turns out to be more complicated than we could have known."
My worry is that, without Labour acknowledging any kind of rethink, and without a recognition that Cass may have some relevance to self-ID, you've still got the zealots of the Dodds and Rayner variety out there, and Starmer in the middle trying to finesse a word salad that he thinks will keep everyone pacified.
So I'm pleasantly surprised, but not counting any chickens just yet.