Elsewhere in that interview, he admits that he hasn't used Linux.
BSD is nice and all, but the only place it's going to survive is in OS X.
In 2005, the freely distributable *BSD operating systems offer no significant technical or economic advantages over Linux; their relative obscurity means that there are business reasons to favour Linux (or, indeed, proprietary UNIX) over *BSD.
This is a very, very bitter pill for the *BSD people to swallow.