First, all they see is that is I2P traffic(or rather they see it's encrypted, as the protocol has no magic bytes anymore afair). And secondly they haven't done

First, all they see is that is I2P traffic(or rather they see it's encrypted, as the protocol has no magic bytes anymore afair). And secondly they haven't done much work in regard to blocking UDP afaik, so unless that has changed, they can't really censor I2P once you got it up and running.