Aubrey de Grey is odd, but very charming and really, really smart;
He wants to live a very, very long time;
He's smart enough to have figured out the seven feats of bio-engineering that need to be accomplished in order to prolong human life indefinitely (barring accidents, murders, etc.);
The article's author, Sherwin Neuland, thinks de Grey is almost completely isolated from the real world as far as biological matters are concerned, and that, even if de Grey's seven problems could be solved, the indefinite prolongation of human life wouldn't be a good thing either for individuals or for the species.