Duchamp once said "C'est le spectateur qui fait le spectacle." (it's the spectator who makes the spectacle) To me it means that art is not complete until somebody sees it and also that the spectator needs to make an effort to really get the most out of the work.
He said this long before anyone had a computer, let alone played games on it. And it holds true for video games as much as it did for books, sculptures and paintings. Not more. But different. Different in the sense that the artist can indirectly respond to the reactions of the spectator. In that sense, it is the artist who becomes more powerful in video games, not the spectator.
I think considering the player of video games as an artist comes from 4 different ideas.
1. In sports, the skillful manipulation of game rules and props can result in an aesthetic spectacle. This is most clearly demonstrated in figure skating and gymnastics.
2. Something similar happens in music and theater, where performers interpret a giving text or score and express it according to their own artistic sensibilities.
3. The desire to glorify technology as something revolutionary, usually expressed by people whose ego depends on this glory.
(I may have been guilty of this on occasion myself
)
4. Marketing: to stroke the ego of the consumer into thinking that they will be an Arrtist when playing game X.
and now I'll read your article.