Interesting question! Since it's an especially interesting question for those not fully in the in-crowd I thought it might be worth rephrasing in less technical language:

Is MetaMed comprised of LessWrong folks or significantly influenced by LessWrong folks, or that style of thinking? If so, this sounds like a great test of the real-world efficacy of LessWrong ideas. In other words, if MetaMed succeeds that's some powerful evidence that this rationality shit works! (And to be intellectually honest we have to also precommit to admitting that -- should MetaMed fail -- it's evidence that it doesn't.)

PS: Since Michael Vassar is involved it's safe to say the answer to the first part is yes!