He recovered pretty quickly from a much more powerful attack, while already injured to begin with. If Base Luffy plus AdCoC can do what it is doing to Kaido with no named attacks, then imagine how powerful named AdCoC attacks from Hybrid Kaido are.
We've seen this story before
922 luffy knocks kaido down
He gets kod
1000 luffy knocks kaido down
He gets kod
1010 he knocks kaido down
...