Say what you will, but implementing all manners of tags so users can express themselves, just to specifically leave out one is exclusion. "Move aside, heteros, this is our game!".
You can argue that they deserve it, that the developer has no obligations, that they are represented everywhere else and that they should play those game instead, but it remains exclusion.
Apart from them straights not being a Monolith, I feel there is a difference between not being represented and being actively excluded. You know, one is bad and one is worse.
You can and should leave a "Need a ____ tag" at the forum then. Don't know why the article is so snarky about that, the poster of that seemed reasonable enough on the first 2 pages.