you're a mod, but you still rely on people who are actually lgbtq for the info, so basically the same as an lgbtq mod. The thing here is that this person is saying that people who wouldn't even ask an lgbtq person and are also straight should be mods, which is just plain off stupid.
E.g. somebody could try to make a point that omni bi and pan are all the same thing, and a straight mod could see that as a normal thing to say. Meanwhile, as an omni person myself, I find it incredibly offensive and annoying.
Point being, most straight people, ally or not don't fully understand the view of lgbtq people. So it just makes sense.