A `firm order` is a business term to mean an order which is non-cancelable. It would be correct to say Pfizer was only tangentially connected to Warp Speed as Warp Speed money was used to place the firm order of $2 billion doses with Pfizer.

Pfizer knew for a fact, even if COVID was miraculously cured, or it turned out there was a super cheap treatment, or anything that made their vaccine worthless, they could still sell $2 billion units to the US.