All those parcors were friendly to Lance as well, so I don't see why that should be a variable. Besides, Wiggins dropped his opponents in the mountains anyway. The only think that made that Tour favourable to him was 1 tt too much. Take away 1 tt from the gc and wiggins still wins that TDF comfortably.
But as far as the dicussion of whether wiggins dominated the tdf which he was 2 seconds off leading the entire race, or whether he scraped through it, here is a fun fact.
Wiggos gap to Froome in the 2012 TDF was bigger than the gaps of the
4 previous grand tours put together.
And wiggos gap to the next non Sky rider - Nibali, was over 1 and a half minutes greater than the gaps of
the 6 previous grand tours put together.

I tried to fit the 2010 Giro in as well to make it a magic 7 but alas it falls 25 seconds short. Judging how they performed though, had there been more mountains, it probably would have fit.
If what you are saying is that Wiggins didn't win 7 tdfs like Lance did, well yeah, Wiggins only started being a beast at 32 years of age. 1 can use that exact same argument to say Horner isn't that suspicious because he's only won 1 gt - and it wasn't even the tdf.
But Lance never had anything close to the season wiggins had. He may have had more great seasons, but in all his tries he never came close to the all conquering one wiggins had in 2012.
Illustrated by the fact that Lance's highest ever cq points total was 2110 in 2002. THe other 6 occasions he didnt crack 2000.
In his one season on top Wiggins on the other hand scored 2687. Thats 25% more.
Wiggins also had according to cq, by far the most eficient cq season as far as race days per points scored goes.
He scored an average of
47,14 points per day in 2012.
Froome is next at
46,10 in 2013 and then theres a massive drop to the closest non Sky rating:
Gilbert 2011
42,97 points -
More importantly, since we are comparing to Lance, Lance's highest ever was -
35.76, far smaller than Wiggins.
You can say Wiggins didn't dominate like Lance if all you look for is longetivity.
But as far as their top ability goes, Wiggos one season at the top, alone was by all measures significantly better than any season Lance ever had.
So to your point about whether Wiggins acheived "Lance-esque achievements on the road, unbelivable domination", he far surpassed them.