Yeah Costco gas stations are specifically designed so you can fill up at any pump.
Why does the gas station traffic flow only one way?
Costco’s approach to gasoline is the same as inside the warehouse: high volume and low prices. One-way traffic makes it easier to get in and out of our stations quickly.
Our extra-long hoses allow fueling from either side of the vehicle, so there is no concern with which lane to choose.
https://www.costco.ca/gasoline-q-and-a.html