I had red flags just looking at it as someone who does this work for a living, between the obvious visual problems and also the scale at which he apparently pumps these out, but what set it off was his insistence that he "didn't have the HDD space to do a timelapse of [his] process" when someone asked him to share his process. If it was really pixel art, taking two dozen in-progress versions of the work and then turning it into a gif isn't hard - especially in photoshop.