I'm not sure if you're joking but your comment expresses it backwards - according to the op article, meta made 28 such bots. One of those bots had the insta profile tagline "queer black mom". In between meta's creation of the 28 and the story arriving on your dinner plate, someone decided to focus the coverage on that one of 28. They thought it would be interesting to people and clearly were right

What they're saying is that the odds of such a combo are far less than 1 in 28 IRL.

How did you determine that?

I'm not OP and I have no idea what the actual odds are. But, well, only 15% of Americans are black to start with, and obviously only half of those are women - and at that point we're already down to 1 in 14. So, unless every other black woman is a queer mom, there's no way it's 1 in 28.

If you were trying to mimic a distribution of Instagram users, and you rolled the dice 28 times, it's not unreasonable that this combination of traits could be expected one twenty eighth of the time.

This is birthday paradox logic, not census logic

A birthday is only one metric that the people in the school share. This is five variables.. So no..