What a shitshow. The studies all show that puberty blockers have positive or neutral effect on trans people's health, the "insufficient evidence" they're claiming here is literally just that the people running the studies didn't refuse to treat one group as a control.
If you want to claim you're "evidence-led" maybe you should follow the evidence. If the best studies support puberty blockers banning puberty blockers is not "evidence-led". If you believe the evidence isn't strong enough you're welcome to run your own study too, but good luck getting past any ethics committee with a proposal of "let's force gender dysphoria on kids as a control".