Of course, VW does not make the windscreens, I don't know who the OE supplier is though...
OEM screens are made by Pilkington with the VW badge on them. I have had the windscreen replaced last year in January by Autoglass. They did a top job, the replacement glass was also Pilkington, same to the OEM except the badge. It even had the same codes stamped on it as the OEM one.
I believe the MK7 windscreens are sh**te, they crack really easy. My OEM windscreen lasted 7 months and the replacement got chipped last week by a stone which came from nowhere. The replacement windscreen lasted a bit more than the OEM one, a little over a year. Never had this issue with my previous cars. I guess it's all about cost reduction these days which on a 30k car is horrendous. Same story with the water based paint on these cars. It chips so easy...