Well not really, that's not a greenhouse... and even if they grow something on the roof, the space is still limited... I doubt they will have enough vegetables to provide everyone at the market for more than like one day!
Interesting, have not heard about this. Is this project still happening because that article with the April 22nd target date is from last April and I can't say I've noticed anything going on. Then again it's not like I'm looking up at the roof when I'm there.