I don't think Streeting ever believed that transwomen were really women, just like I don't think Starmer ever did. In fact I'd go as far as saying that noone ever has thought that transwomen are really women, including the transwomen and TRAs. Hell, especially the transwomen and TRA. And that's the route cause of all this mess.
People who know a fact is true don't need external validation. I know the sky is blue, my reality doesn't fall apart of someone tells me otherwise. But for a trans person, they need that external validation. "If other people say I'm a woman, if other people treat me as a woman, the more other men believe they're a woman, the more we validate kids feelings that they're the wrong sex. If all these things happen, if all these people believe, then maybe I'll truly believe it too."
It's the Emperor's new clothes, but it's happening because a few people are trying so very hard to believe it into existence, but can't unless everyone else believes it too.
And the left have bought into it. (And I'm not disparaging the left here, I'm very left leaning). They've gone, we're the progressive ones, and we know where this ends. Racism, homophobia, all end up with acceptance, (mostly, in the UK at least). Acceptance is the end game, so let's just skip straight to that.
They've tried to do the right thing, not realising the one huge difference, that trans ideology is a fiction, and believing in a fiction is harmful.
Accepting gay people harms noone, because being gay is fact. Men can love men, women can love women, believing and accepting that harms noone.
Accepting people of different colours and races harms noone. They exist, they are not lesser because they are different. Believing and accepting that harms noone.
So, progressive people think, believing and accepting trans people must also harm noone. But it's different, because it's a fiction. Believing that fiction does harm people, female athletes, children, women who just want to pee without a man in the room.
But now the fiction is accepted. Noone can dissent, call out that the Emperor isn't wearing any clothes, for fear that they're the only one who sees it, for fear that they're wrong.
Except for the few, the small children from the story, the JK Rowlings of the world in real life. And it takes time, but they make it OK for a few more people to say it, and then a few more, and a few more, until it snowballs and we're all pointing at the Emperor.
That's where we're getting to now, and it's why I didn't believe Starmer believed what he said when he said some men had penises, and why I believe he's telling the truth now.