Galaxy
It depends what you mean by support Luminance, the NHS has moved away from the affirmation model since the Cass report.
We can't tell children they can change sex because it isn't true, as far as I am aware that was always part of the discussions undertaken by medical professionals, with adults anyway.
Support, listening, empathising, acknowledging that they are going through something whether we understand it or not. Many children are in therapy and there are a lot of ways it is safe for children to express gender without being told anything about sex. Imagine what it feels like to go through puberty and changes you don't want. Children can be absolutely distraught. It needs specialist help, no amount of internet discussion will make gender dysphoria any easier to live with.