I read this as problem with enforcing. The building was built and operated as a service station in 1950's. They upgrade the pumps sometime in the 1990's. However, there was no building permit issued because they were replacing like or like. Which applicable building code do we use? No building code for the building and unknown which code was used for the pumps.

2309.4.1 Dispensing systems. Dispensing systems shall be maintained in accordance with the applicable building code.