It is fair to say Streeting cannot be fully trusted, but that goes both ways. I think he is misleading and lying to the TAs here.
One - gender ideology is an electoral liability for Labour there is no way anyone who wants to have a chance vs SNP, Reform and Tories wants to go into an election confused about what a women is. Every day that gets more and more true. Look at the trend in the US. Look at the stance Scottish Labour are shifting to. Also the medical evidence is stacking up. The TAs keep losing court cases. The trend is one way. An ambitious politician will see this.
Two - As the Greens and possibly Your party as well go in for TWAW it is very much to Labour's advantage to go down the realist route. However also to lie to the TAs about their commitment to it. Basically Labour will be in the centre position they will be "nicer" to "trans" people than the right, say things, but do not much which cause them electoral damage. Meanwhile they get to look more sensible than Greens etc.
Three - As the recent nominations for the Deputy Leadership shows the TWAW faction inside Labour MPs is now tiny. Shabana Mahmood who was a supporter of Labour Women's Declaration is now Home Secretary. Streeting is ambitious that means appealing to most Labour MPs.
Four - Fear. Yes Streeting has been a snake. However lets not forget which side has brought down Sturgeon. Streeting isn't dumb. He knows that basically a core of lefty women who know they exist and refused to back down brought down one of the most successful politicians in Scotland. Yes maybe Streeting might want to turn on women. Yet for anyone not a fanatic the idea of going up against the Terfs in 2025 is not an attractive plan. Because the pro-women side has been taking on the NHS, Academia, the biggest corporations, the entertainment and fashion industries inside the UK and still keeps winning. Much of the British Right only switched sides to supporting women AFTER Terfs took the establishment on and they could see it was possible. That Streeting is a coward is hardly surprising, remember still very few people on the left will openly say the truth. The Terfs were right. Yet when the cameras are off they are saying it. The old saying is true - Let them hate us as long as they fear us.
Five Streeting is gay. I think he knows the TAs are homophobic, he doesn't want to confront them about it openly. He knows though. He was in denial about it for ages, but I think it is going to be difficult for him to go back to blindly sending gay kids to wreck their lives. Yet he still wants the LGBT community to like him. There is a deep conflict here for him.