While you are technically correct, all of my contact with GSN's from engineers that state as the OP stated are referencing any of the D1.1 approved processes with a 70 series electrode. They will approve your submitted WPS's in FCAW-G or FCAW-S, GMAW (Spray only), SMAW, and/or SAW (which is not in use 99% of the time, especially in the field) as long as you are using a 70 series electrode that is low hydrogen in nature. We know what that means for SMAW (99% of the time it will be 7018) and a good share of the commonly used wire electrodes and gas combinations for GMAW and FCAW qualify as well.
BUT, either way, you must submit the WPS's, Welder's Certs, and material specs (probably with the MTR's) before work begins to get engineer approval. It covers both you and the engineer plus it is in the codes and usually in the GSN's as well. Along with your shop drawings.
Then, don't forget to get ahold of the inspection agency for the job and see if any pre-work inspections will be required either by customer, job specs, or code.
Now, it sounds like the OP is the inspector on the job. You need to find the submittals (WPS's and welders' certs) to see what the engineer approved. BUT, more than likely, wire is okay under the specs as you have stated them. You will need to make sure of the wire, gas, operating parameters, etc. Some FCAW-S wires are not multi-pass pre-qualified by manufacturer's specifications/recomendations. Any gas process on field erection you will need to watch wind speed (see 5.12.1 in D1.1-2008).
If they are already setting up for work this needs to be accomplished pretty quickly. Should have been taken care of at a pre-work meeting. LOL!!
About 10% of the time if we are lucky.
Have a Great Day, Brent