Yeah, that's possible, though after reading about this I think he's suggesting chemical reactions in the core are accounting for the increase.. I'm not great with science so I can't really say for sure what he means.
It really doesn't matter one way or another, modern measurements dispute any claim towards this in the first place. It's a nice idea but I'm pretty sure the earth doubling in size in the course of a few hundred million years would have been something we could have scientifically picked up on.
Oh, but scientists HAVE picked up on it, but it's all part of this big conspiracy to keep it quiet because it'll change all of science as we know it!
I love how every time someone comes along with a new hypothesis that gets discredited, they call it censorship and say that there's a big conspiracy. They never understand that to be taken seriously, you have to go PUBLISH your findings in a REPUTABLE JOURNAL. Same thing that happened with the Intelligent Design crowd.