The whole premise that "Of course Sabo is stronger than Luffy, he's the older Brother" that was used to justify Sabo > Katakuri and so on, was always flawed and silly: a bad argument with questionable reasoning.
Luffy is stronger than Sabo, but I think that I'd go even beyond that and say that Luffy has edged out against Sabo ever since he revealed his Gear 4th in Dressrosa, and Luffy had to be the one to finish off the bad guy rather than Sabo.
I don't think that Sabo's performance against Fujitora changes that, since Luffy also fought Fujitora, with a similar level of seriousness, and much like Sabo, wasn't overwhelmed even while limiting himself to Gear 2nd and 3rd.
Currently, Luffy is top 10 in the entire One Piece world. Sabo > Luffy is pretty frankly ridiculous by this point. People should just drop it.