No, fewer digital changes than the blu-ray. You are probably thinking of the HD version of the Lowry DVD master, which had a CG re-do of the car going off the cliff. The wowow is a newer 4K remaster done for the 2011 30th anniversary and has much more accurate color than the blu-ray.
I thought it had some recomped elements and also erased the guiding rod for the boulder?
Yes, it has the same digital tweaks as the DVD but not the additional ones added to the blu-ray or the CGI shot from the HD Lowry version.
I thought the Blu Ray was closer to the theatrical. What was changed?
The entire film has a “modernized” orange/teal color scheme inconsistently applied, it is brightened to the point that shots are overexposed, the sound is remixed, it has heavy DNR and there are additional digital tweaks. The blu-ray is the least faithful of all official releases.