Not gonna lie, i'm shocked because it really looks like it, and relieved because now i won't feel as inferior to this. What is it then?
Wait no, i'm sure this is pixelart, it's not vector, or 3d... maybe just drawing?
Not all raster art is pixel art. This is a misconception that's not so common but prevalent enough for me to have noticed. In pixel art, you can't use brushes or anything that changes a pixel into a color or opacity you didn't manually choose and deliberately place. You're limited to pencil, eraser, floodfill and selection/move tools. 
you can use brushes, its a common misconception. You cant use brushes that you cant fully control, that is the spray bucket tool and brushes that have different opacity on different pixels, otherwise you can do about anything you want.
Also, there is lots disparagement between artist about what actually is pixel art. Because when they first coined the term "pixel art" people were already using 3d and other sorts of graphics. So a lot of pixel art from the golden age of pixel art (demoscene that is) don't count as pixel art.
So arguing about what is and what pixel art is not is pointless.