Disclaimer: It was written in 2009, read in context it's very clear the first interpretation is the correct one, there's an entire concept of identity that didn't exist in the public discussion when this was written.
I think it's a pretty good idea to think about how to not be a "Java programmer" or a "kitesurfer" (to pick two things that I could be identified as), since the former sets my brain up to be implicitly against, say, Kotlin or Haskell, and the latter sets my brain up to be against windsurfing. And I like all of those things too!
But certainly, there are things that are core to someone's identity, and I guess that's where each of us needs to find our own boundaries.
Identity can be a tool and a crutch. My feeling (as someone who identifies as human and has been hanging out/coping with the world for 3-4 decades -- a feeling, informed by a lifetime of good and bad situations) is that identity politics hurts more the identity-assertion people; the opposite faction is merely annoyed.
This is pretty common amongst business leaders; comparing their statements against their serious work quickly shows that it's not all so warm-and-fuzzy.
Virtue signaling may be its own reward to the masses, but it serves a real function for the well-to-do in preventing or at least confusing a Marie Antoinette effect. If there's any "let them eat cake" to be found, they can point to an abundance of more recent "truth to power" statements that will create enough ambiguity to tamp down the fervor of the mob, if and/or when it comes to that.
Furthermore, some people would say that everyone staying in the closet is bad advice for the gay community overall, as it means the average person will only hear about the 1% of gay people who are arrested for sex crimes, not the 99% of gay people who are perfectly nice people living normal lives and minding their own business, or the great scientists and inventors and authors who happened to be gay.
This is, as I understand it, an area of substantial strength of feeling in the gay community - it's part of what underlies concepts like 'gay pride' and the famous chant "we're here, we're queer, we're not going to disappear".
And although I've used gay men in the example above, it applies to any minority group - although with different details, I've never seen a female programmers' pride march!
But here's the nub: the mental illness belongs to some contexts (therapist, friends, intimate relationship) and not others (trying to sell a project to a client).
The part about preferred pronouns feels a little too abstract and counterproductive. This is a personal feeling, coming from a personal interpretation of sources of wisdom. And it's not because it makes other people react in this or that way -- the point is not conquering the Other, you can't do this anyway. It's about how you set about to cope with the world and grow with it; how you deal with your own subjectivity.
Maybe I'm wrong. It's a very different minoritarian perspective.
Google isn't turning up anything. What was the issue with Friends?
Apparently friends is problematic. Racist, homophobic, transphobic, sexist and fat'ist (Is that an 'ist?).