Well, it was only a theory. Must have been quite a manoeuvre to get it back on the centreline from the starting position in the previous photo. Or there's a dark patch on the grass that just happens to be coincident with where the aircraft is in the picture.
More interestingly, that nosewheel pair does look well over to the right... Unnaturally so. I don't know the technicalities of the ATR but that sort of steering angle on most aircraft is only reached using the tiller or if there's been a problem with hydraulics, mechanical failure, etc.