He's refering to Yhorian's "Solo Ranking" lowbie mage thing where he solo ranked to... I think 25 or thirty, a whole bunch of different mage classes and put up some crazy numbers. Here you refer to alot of Higher-level mage powers (voker shields, transmuter malleability, conjurer servitors) which Yhorian did not use because he was too low level to access them. What Yhorian did was use vuln exploiting wands and some kind of (i'm thinking) insane lowbie sets or something, while hitting high level mobs and then bartering their gear to a mob healer to replenish his hp.

As an aside, Yhorian when are you gonna post more about it? You claimed to be in the process of preparing notes for the Wiki.