They do, of course, since it's their trademarks.
But I think you're considering the word "disparaging" in isolation from the other two used. Taken together, it's a pretty clear indication of what they won't accept, as Umbran pointed out.
Unless, of course, you're objecting to the "libelous" and "dishonest" parts, in which case I can't help you.
The libelous and dishonesty parts I'm not complaining about. Again, I'm not saying WotC is evil. Just...kinda thick right now.
The GW comparison is amusing as, when I linked this to other people, their immidiate responses were all "Sounds like something GW would do."