I should mention that league of legends has been on the receiving end of an extreme DDoS attack starting relatively the same time as blockland's, and is still continuing as we speak.
By the way, it's not PhantomL0rd doing it, it's the hacker group known as DERP. They've been monitoring his computer and whenever he plays a game they grab the ip from his network packets and DDoS it. This has affected things like League of legends, Dota 2, EA's website, Club penguin, and other things.
I doubt PL / DERP has anything to do with the current blockland DDoS; Given the current information I believe it's somebody else, and they just coincidentally started the attack around the same time as DERP's.