Putting propaganda in children's game is the right thing to do? OK. That makes sense.
Now, Just so I don't have to rehash this again *sigh*...
Propaganda: information, especially of a biased or misleading nature, used to promote a political cause or point of view.
According to the article presented in the OP, Crawford said “I wasn’t about to have this book go out and not acknowledge that people like me exist." There are two parts of the quote:
1. "I wasn’t about to have this book go out and not acknowledge..."
2. "...people like me exist."
There is nothing wrong with part 2. It's not propagandist at all. It's factual. The LGBT community exists. Personally, I see no reason why we all shouldn't embrace that community. My problem is with part 1, which shows an intent to present a certain world view.
Now, as I have stated before, the inclusion of "people like [him]" (which is a terrible way to phrase his motivation), could be handled well and make sense within the context of the source material and the adventure, but the way Crawford states his intentions is unsettling. They point at a political or at least an ideological motivation, which makes the inclusion of the LGBT a propagandist advance.
Now, part of professional career is to promote democratic values and tolerance in the developing world - so don't go saying I'm some kind of bigot, because I'm not. All I'm saying is that there is a place for political discussions, but placing ideological propaganda in a children's game is not the right way to go about it. Whether or not I agree with the message of this particular piece of propaganda is irreverent. D&D is not the right coliseum for the battle of ideas to take place, in my opinion, and I will continue to advocate that very simple, reasonable position.