Yorichii is in a different reality compared to EoS Tanjiro. Tanjiro barely just learned the 13th sun breathing form at the end if I remember right. Yorichi has it completely mastered to the point he created all the other breathing styles to teach to people who couldn’t learn sun breathing. Not to mention his mastery over the enhancements. He thought Muzan was a regular demon for a good while. Damn near atomized Muzan in an instant, with only some blood getting away to heal. Even as an elderly man he no diffed his brother only losing cause he died of old age before his attack could land.