Since the concept of the project is to turn game boxes into posters, I don't think the results should necessarily fulfill the same standards as boxes on display in a store, including blurbs or credits.
Granted, by now I've added versions of the posters including credits to several of the games, but it's still quite pedantic to criticise the project for that, without having anything positive to say about it at all.
Buy hey, that comment was made years ago, so why bother.