I'm at least 90% sure that you haven't read the relevant chapter of the DSM-5, because if you had done so you would know that it makes no mention of whether and when any given "identity is now considered valid." About the most one can say is that identity itself is no longer clinically pathologized, as it allegedly was in the previous DSM.
In my copy of the manual, the chapter starts on page 451. I'd be happy to type out a paragraph or so here, if it would help you clarify any of your claims about experts and validity.
Oh I've read it thanks, and I know exactly what it says and what it means.
Perhaps if I put it this way, it might be easier to comprehend:
1) The APA continues to consider that a biological female who identifies as an attack helicopter (or as a dog, or as the late Eleanor Roosevelt) is suffering from a psychiatric disorder.
2) The APA no longer considers that a biological female who identifies as the gender "man" is suffering from a psychiatric disorder.
3) The necessary outcome of (2) above is that the APA now considers transgender identity to be a valid condition.
You can continue trying to dance on the head of pin forever, for all I care (I don't care). As I said before, I couldn't care less (or, confusingly, I
could care less - if you're an American) about the views of many in this tawdry little echo chamber of barely-disguised anti-transgender views. I care about real-world outcomes, real-world policies, real-world events. Fortunately, the real world is increasingly getting it right, and many/most participants in this thread are getting it bang wrong (even though, ironically, they appear to
believe they're getting it right ahahaha).