Luffy was struggling to dodge Hybrid Kaido even while using FS before the adv CoC buff while Kaido was dodging his attacks with ease. But post the adv CoC buff, Luffy is able to keep up with Hybrid Kaido 1 for 1 for some reason.
Now I don't know what happened lol. Either Oda gave him multiple boosts in all stats to push him to the scale of a Yonko as fast as possible or adv CoC gives some form of speed buff as well, while I personally lean towards the former, knowing Oda's track record.
This is why I think, at the very least post Chapter 1010 Luffy, should not be used to scale his previous opponents since there's a clear boost in all of his stats, to make him undeniably a Top Tier.