Walker from Teespring here. Wanted to jump in and say I was also confused by this, and Evan is on a well-deserved vacation right now so he's not around to clarify.

This was a real-time interview, and I was the one who edited for grammar because Evan had already left. I'm assuming this didn't come out the way he intended it to. I can't imagine (though I could be wrong I suppose) he is under the impression Postgres doesn't work with PHP.

When he gets back I'll have him chime in!