Understanding why Zoro fans took an L in this fake spoilers is more interesting that debating of the fake spoilers itself.
It's clear enough that if an healthy Zoro and an healthy Kaido met Zoro would hold his own.
King of Hell is likely scarring Kaido under a similar pattern Oden accomplished, and his defence is good enough he should be good enough to afford taking some hits before going down as long as this is an healthy Zoro we are inferring about.
We don't know how Luffy vs Kaido will be like, I can see it being an extreme difficulty victory for Luffy more likely.
Even if Luffy is stronger than Zoro right now the gap is arguably much less consistent than some downplayers happen to believe.