It may have been a bit abrupt, but, that really is probably most appropriate.
An ob/gyn has their training for all the internal organs that gg's are born with, uterus, ovaries, fallopian tubes, cervix, as well as the vagina. And those delicate organs can have a lot of complications.
For we trans women, most of our issues are primarily external and urological. The one serious condition that can affect both gg's and trans women are vaginal fistulas. And while an ob/gyn could diagnose this condition, they would probably consult with a urologist.
Vaginal infections can also be diagnosed and treated by a urologist.
Also, if a gg has a urological issue they would probably be referred to a urologist.
I had this discussion with my physician as I was going through my transition, who has several trans patients and he was quite informative about the topic.
I do see a urologist who did my orchiectomy and also did a follow up with me after I had my SRS.
-Sandy