It's also, though it's not mentioned in the article, much cheaper -- I think you'll pay about one third as much for your apartment in Berlin as you would in London.
This is actually the most ridiculous things I have read in a while. There is so much opportunity in London right now, it's a great place to be even for those whose aspirations differ from "banker", "football hooligan" or "curry shop owner".
The one thing I will agree with is that it's not cheap. I think it is fair to say London is probably 3X more expensive than Berlin.
There's a lot of bright people doing a lot of cool things in London albeit under the smoke screen of the financial industry.
Rents may be cheaper in Berlin but I believe that salaries are also less. So that might be good for a founder but only _IF_ they can convince good developers to work for less in Berlin.
(Can't believe I'm replying to the troll)