Wow. Great way to set the mark for the rest of the article.
It's obvious they can't (right?).
In all seriousness, even for the "traditional" multimedia/interdisciplinary art the question is not settled, and it's even harder to argue for video games being art.
Using the more conservative framework it's easy to posit a game can be a vehicle for showcasing art (music, graphic, literary), but if it's not bereft of the basis of a gameplay, the end result becomes encumbered with additional purposes (like player enjoyment/subscriber's engagement/competitiveness/etc.) which dilute the intention of the object's existence and make it not art.