Yes and no. Yes in the sense that you can't take the human being out of the moderator, nor would it be good to try. No in the sense that I'm not moderating HN just according to my personal interests—it would be very different if I did. As a matter of fact, I spend every day denying my own preferences about HN. That doesn't make me objective (far from it), but I do at least have a lot of practice.
It's a matter of striking a balance: holding space for what the community finds interesting* while allowing for a certain amount of idiosyncracy and unpredictability, but not too much. Without that, things would be more humdrum and therefore less interesting. There are tradeoffs along every conceivable axis with this thing.
* (note: community is not the same as commenters because most readers don't comment)