If the top of that were green, that would mean another color would have to be out of place it pretty much a similar situation and you'd just be put into an infinite loop of how a color should be changed to fit more with the picture.
I haven't done rubik's cubes in a while, I can't remember if that's possible to have only one cube twisted like that in its corner and the rest still be right.
First of all, the piece is the Red-Green-Yellow corner
Second, the cube is impossible to solve. If you take out any piece and flip it (for an edge) or rotate it once (for a corner), the cube becomes unsolvable until the same procedure is done again You can apply it to a different piece and it'll still fix it. That's what makes a Rubik's Cube work in the first place To fix an edge, just flip another edge piece. The corners are a slightly different case. If you rotate a corner one way, you can fix it by either rotating another corner the opposite direction, or by rotating two other corners in the same direction. The centers don't matter because they can't be moved anyway
While it is possible that they just switched the stickers, I was going off of the assumption that they just rotated the piece. I just assumed the top side of the piece was green with glare