This article just confuses me. If I would have wrote it, I would have put my name as unknown, too.
I think I see your problem... In very simple terms: You add from below and take away at the top. Get it?
There’s two forces at work here.
Erosion, the wearing-down of mountains, is easily understood. Mountains start eroding the minute they are formed.
The uplift is due to “glacial rebound”, though it wasn’t explained too well in this article. In brief, all the former glaciers that sat on the Alps weighed them down; now that they are melting (and thus weigh less), the ground is “springing back” (albeit very slowly), like a chair that has been sat in awhile.
A similar situation occurs today in Hudson’s Bay, which is still rebounding from the last Ice Age (about 20,000 years ago).
BTW, this process also really complicates figuring out where ancient sea-levels were.
More: http://www.en.wikipedia.org/wiki/Glacial_rebound