Nah, sorry but I'm still calling this an outlier. These drugs and poison from the likes of Tamayo and Shinobu wouldn't be enough to bring a character supposedly far above Low 7-C down to 8-B+. Muzan was heavily weakened due to a drug from Tamayo, yet he was still immensely superior to all the Hashira and only Sun Breathing Tanjiro could actually fight him off. The gap is simply too much and, based on info we already have, I cannot in good faith say this isn't an outlier.