He also doesn't appear to know the difference between puberty blockers and cross sex hormones which are actually what can cause potentially irreversible changes and which are still available for under 18s and which would be the usual proscribing route for those over 16. There is little point blocking puberty when it's almost over and the practice alleged at The Tavistock where they forced 16/17 year olds to go on blockers for a year before being eligible for hormones was just medically absurd gatekeeping.
Most of those spouting off about this, including Streeting, don't even understand the most basic facts of trans healthcare. But then this isn't really about medicine. Puberty blockers have become totemic in the (mostly online) crusade against trans people. Most of them don't actually give a shit about the evidence, they just want the win, a big point scored over the so-called trans lobby. You can see that in the reaction to Cass which despite it's many flaws does not actually call for blockers to be banned and acknowledges they are the right course of action in some cases.
That's the Cass report they hold up as gospel, which they've managed to spin as calling for a complete end to youth transition when it doesn't say that at all. Facts don't matter. The kids don't matter. Not even Cass matters. Winning the argument and hurting trans people is all that's important.