It was sarcasm. Earlier in this post he specifically said
Which is legitimately his asking for credit for the graphical content he made. Besides, would you legitimately take his art and claim it as your own in a project? Don't ask to give credit. When in doubt, give credit. When not in doubt, give credit. If you did not personally make it, and you know specifically who made it, give credit. There is never a reason to not give credit to someone.