I saw an article with pictures and honestly, I believe it. I've stayed in similarly gross Disney resort rooms. I once did find a condom wrapper on the floor just under the bed. This story happened at the pirate rooms at Caribbean beach, which at this point have reputation for being gross and in dire need of refurbishment.
I can also appreciate the concern with having autistic kids that put non food items in their mouths. It's a very real concern. The amount of dust in those pictures would be enough for me to request a new room because my son has severe allergies. The room was "Disney gross," in my opinion...that kind of dirty that comes from crappy housekeeping.
Not to say this family deserved the Grand Floridian, but I don't doubt the rooms they were given were disgusting. Let's not pretend we all haven't heard those stories. I honestly doubt they ran out and scrounged up dead roaches to plant them in the room, nor did they bring in dust to sprinkle around, and frayed wires to plug in.