I'm probably putting a knife to my own throat by writing this, but I think you are being a bit hard on him with that comment. While I appreciate the point you are making, it is ill-worded and more hostile than critical.
Next, it was a "big, brave thing" he did...at least for him. Don't belittle his experience or feelings. In fact, the use of the term "fetish" is sort of a cop-out in trying to claim that somebody else's relationship to a given experience is lesser than yours. It was his experience and to tear it down because you felt that he didn't put it on as high a pedestal as you would want it to be is insulting to his feelings. He did not de-personalize his partner during his discussion...he called her by name (I don't know whether it was her real name or not) through the entire description. That in of itself, lends credence that he considered her a person, not a sexual object.
Whether you want to acknowledge it or not; for a significant number of heterosexual men, engaging in sex with a pre-op transwoman for the first time is a big deal. There are a lot of mental/social barriers and emotional conflicts that have to be crossed to make that move. It is not as easy as you are making it out to be for many straight men. In fact, experiences just like the one that the OP described are what is going to eventually going to close the gap of comprehension.
Furthermore, we are not living in a transhumanist paradise where transitional sexuality is a commonly accepted thing. The fact is that transsexuality is at best, considered a novelty within mainstream society...we aren't better than that at this time period and we are going to have to work harder. Your particular brand of criticism is not going to serve to improve things. Understanding comes in small steps and smaller bites.
Next, when we are discussing a man's sexual encounter with a male to female pre-op transsexual, the genitals are going to be the one thing that will keep coming up in his mind. Your argument is pretty much dismissing his concerns and feelings during that encounter. Especially since the discussion was about just that. While her feelings were important to her as we obviously saw; his post was about how he felt during his experience and the conclusion that he came to after this encounter (his decision to include pre-op women in his field of sexual preference).
I think that he did a good job of expressing his feelings with that experience, all things considering. Let's face it; he did take a big step in exploring his sexuality...it's a step that the vast majority of men would not even consider taking.
One final thing; you do realize that this is a hook-up at a bar that the OP wrote about, right? From the way that this went down; they are not dating or engaged in a serious relationship. Two people met each other and decided that they wanted to fuck. The pre-op girl was worried that the cis-guy would have problems with her transitional state; he didn't and then they had a night and morning of good sex.
The end.
In other words; cut him some slack. He did take a big step in his personal paradigm. We should be celebrating that he took that first step, not nit-picking him because he didn't describe it in a perfectly PC manner. Such commentary is risking turning an ally to an enemy.