Only if he was shown/implied to be using it, as we know Luffy's FS isn't always active.
We need to wait for the scans as this could be the equivalent of getting gassed that Tien beat Frieza, but it turns out he just beat his first form when Frieza can go all the way up to Black.
If Luffy's not using gears, ACoC, FS or even ACoA then bro is buns. Base Luffy w/ FS but without ACoC is like Queen level, he wouldn't even beat Katakuri. If that's the version Gaban faced before giving up then that's expected, it doesn't take much to clown that version of Luffy.
Never forget Apoo knocking Luffy tf out pre-rooftop. There are levels to his abilities.