The best gay may have been chosen, but there was only one qualification to actually get the job. You had to be a gay (preferably woman.) No white men need to apply even when 90% plus firefighters are male and 90% of them are non-black.
Black firefighters make up about 8% of firefighters in the United States. In 2022, 7.15% of firefighters were Black, while 80.7% were White. In 2022, 95.6% of firefighters were men and 4.43% were women.
There are no stats on the percent gay, but the number is very small. And the number of lesbians is even smaller, or you have to assume every female fireman is gay.