I think the plans still match. There are a few decent overlays on TTF that show it better than the one on here using the aerial shots:
I borrowed this one from lead piping:
Remember this photo was taken at an angle from a Helicopter but the plans are directly overhead. It's also much more zoomed out as the track is not that thick in reality (use Oblivions super thick track as comparison) and so would actually fit if it was scaled properly.
It's not perfect but the plans are known to be rough (that's not the same as inaccurate) and a few very clear points match:
1: There's a wide entry section into the pit. This matches up with the entrance to inversion 3 and exit of inversion 4.
2: The exit at inversion 8 is at an angle, exactly the same angle as the pit.
3: Look closely at where the diggers are on the picture. There is one under the lift hill, another under inversion 1 and a third near the spider like creature where the track is supposed to hug the ground. All areas that need excavation.
As for the depth of that pit remember that the inversion doesn't have to go right to the bottom. The pit could in fact be to accommodate a path so that people can walk under the inversion. Remember that there was some issue with the plans of people getting under them (I think there was only a meters clearace?) and the paths don’t have to be accurate. There are two ways that are shown to get to the rides entrance; a winding path and under the inversions. Could the winding path be disabled access but the main path has some fairly steep steps? Under and through the signature inversion?
It's just a theory (it could be that there is something else there they want to hide) but not unreasonable given the steps down to Oblivions pit just next door.
As for the positioning of the footers firstly not all footers are for track
but secondly the plans were made with NoLimits, I think we can assume the exact support location was a bit of a rushed job as there are some points when they intersect the track.
So to cut a long post short all we need is a picture of them excavating the area for the vertical lift hill and I'd say it's shaping up fairly accurately. As it is I'm about 60% certain what we've seen is what we're getting. That still leaves a massive 40% of uncertainty so I'm not claiming this opinion as fact... just yet.