He doesn’t even only block them in his backyard; they’ve ignored member deference to block one in Matt Haney’s district before.
The language he uses makes him a left-NIMBY, but that’s just what they look like in cities. Found in NYC too. In suburbs the same people switch to talking about property values and 50s rural neighborhood character.
You and he agree 100% on building new apartments, Preston hates them, and as a rich man living in a very expensive single family home in one of the most expensive cities in the world, he fits right into the NIMBY mould.
However, Preston also believes that homeless people should still be treated like people, a position he shares with YIMBYs. Due to that commonality, but also having irrational hate for YIMBYs, he is sometimes called anti-YIMBY rather than NIMBY.