Yeah. The Tornado nullified Kaido's storm and cut his flesh in the process.
Yeah that attack was insane, people undersell how ridiculous the attack actually was.
Kaido's 3 tornados were massive, they were reaching the clouds, were probably mountain sized in length each
Zoro nullifies them in a single attack
Cuts the most durable and hyped up part of Kaido's body, his scales
Makes him cough great deal of blood
But thing is Kaido only took tiny part of Tatsumaki, most of it went to nullify Kaido's own tornados. And Zoro still did as much damage to Kaido as Luffy's Kong Gun Gatling with Advanced Haki did.
Its just ridiculous how strong Zoro is lol.
Zoro's tornado = Island level
Zoro's Ittoryu slash a chapter before = Country level