One thing discussion keeps overlooking is that the propaganda point here is not actually, "people like me exist." It is normalization: "people like me exist and are no different from anybody else."
The distinction is hard to see if you already buy into the viewpoint which is being normalized. If you want to understand how Crawford's viewpoint looks to someone who thinks homosexuality is deviant, try plugging in a behavior or lifestyle that you yourself think is deviant.
E.g. a neo-Nazi game designer says, "All of my adventure paths will have blood purists NPCs in them. After all, I wasn't about to let Storm King's Thunder ship and not acknowledge that people like me exist." Does that make you uncomfortable?
If Nazis don't bother you, try pedophiles, Christians, sociopaths, or lawyers. Whatever makes you uncomfortable in real life. Then imagine someone deliberately inserting people with those traits into the background of adventures with the subtext that other NPCs are supposed to treat the person's [whatever]ism as no big deal. Now can you see why it's a form of propaganda?
Let's keep propaganda out of gaming please. And let's keep Nazis out of gaming too, except as drow.