The answer to “more centralized than what[?]” is definitely not the current pool mined, PoW based reality of Ethereum. I think it was quite clear that Vitalik was comparing DPoS to what will be ethereum's own PoS when Casper is out.

Comparing DPoS to the current state of ethereum is similar to saying:

"A startup named 'Space EOS' is working towards building rockets that can go to Mars. Current rockets made by 'Space XTH' can only reach the moon. Then, 'Space EOS' is much better than Space XTH"