Perhaps JK is relieved with John McDonnell's concession that this is an issue to be debated. A big step forward from #nodebate.
Who knows whether Labour wants, or is able to, review the detail of proposed changes carefully without the vested interest lobby - and how many are having their wages paid on the back of the transgender diversity agenda - drowning others out. JM may feel he has thrown out a few crumbs and that is enough.
However the acknowledgement that debate is needed, and acceptable, is a good thing in itself, as it will encourage reasonable voices to contribute, balancing the volume behind different arguments.
I note Sarah Vine is in the Mail again today [https://www.dailymail.co.uk/debate/article-6182741/SARAH-VINE-fears-gender-agenda-harming-children.html] . She received a lot of stick about her similar article in August, when even suggesting there was cause for concern was labelled "hate". When looking for the latest article I noted that the previous one received a tremendous number of comments. Presumably McDonnell and Labour have spotted that the Tories are taking, albeit baby, steps towards examining this issue. And fear that, should there be an election before Christmas, they need to be careful to make sure they don't lose votes as a result.