I think you misunderstood what that bullet point is trying to say. It IS "Postgres-Q-L". That bullet point is talking about someone theoretically thinking that the name is logically two parts: "Postgres" and "QL". When really it's "Postgres" and "SQL" and the middle S is elided.
But it is Postgres - QL, because you have Postgres, the server, and its Query Language. Straightforward.
... okay no I was trolling
For what it's worth I've also always pronounced it "Postgres-Q-L".