The 'debunking' is a bit of a nit pick. Although the original theory of air travelling faster over the top to meet the air coming from the bottom has been extremely widespread I don't remember specifically learning that when I studied Aeronautical Engineering at college in the 80s. In fact we used a rotating cylinder to represent an aerofoil in most theoretical situations.
The nit pick comes from the fact that they are now saying that the air going over the top doesn't meet up exactly with the air coming over the bottom, so that's not the exact reason that the air goes faster.
Basically the air goes faster over the top because it's got further to go than the air at the bottom, that's still true, they're just saying that it's not racing to catch up with the air on the bottom.
Hope that makes sense, typing in a bit of a hurry