Well he's essentially saying. "You're fine just the way you are." Which is what most everyone with any sense was telling people for years.

To get at the core of the issue, disphoria is oftentimes, but not exclusively always, caused simply by kids growing up and not being comfortable with themselves. This is frankly 100% normal to feel growing up. How many kids get a zit or something and hate it? How many kids don't like the changes that come with puberty? There is a transitional period in everyone's lives, and that period goes from childhood to adulthood. For many the trans phenomenon isn't about gender it's about delaying and preventing the transition into adulthood entirely. It's based on a bunch of weird authoritarian gender stereotypes where if a kid prefers playing with dolls instead of with trucks it means they are a girl which is just insane nonsense one would expect from the most braindead right-wing mindsets. And one reason why you see a lot of trans identification in places with such strict gender rolls for those who don't conform to them. At least historically before being trans was trendy.

All he's doing is what every child psychologist would do, quell the kids worry. The kid is worried about how they don't feel good enough to be a boy or a girl or some nonsense, they feel different than the other kids, maybe they are being bullied, you don't go and tell the kid, you're right, you are actually a girl/boy, you need to change yourself to fit better into that image. The kid will believe you, as an authority figure, the kid will seem happier for a time because you've given them some guidance and meaning, but you've given them a nonsense unachievable ideal that they can never achieve either. You've just replaced "I'm not good enough as a boy, I must be a girl" with an inevitable future crisis of "I'll never be a real woman, no matter how hard I try" which is true because you can't be what you are not. It is madness, and I do truly believe anyone who is encouraging this sort of thing has no business being in any sort of position of authority over children. Be that as a medical professional, a teacher, or even as a parent.

There's only one thing you can tell them. You're fine just the way you are. Everyone is different. Not everyone has to like the same things or play with the same toys. There's nothing wrong with you. You don't need to change who you are because you don't feel good enough as you are.