Kizaru not even going all out has absolutely nutty feats.
He mogged Luffy in Gear 4th Snakeman. Almost killed him by kicking him into the lasers. He also speed and perception blitzed him.
Luffy then retaliates by grabbing Kizaru while he is off guard and attempts to throw him in the ocean. Kizaru, completely unphased by the transformation, mocks Luffy for doing it, whips out clones, and cuts up Gear 5th. Luffy responds by destroying the clones and even using Future Sight doesn't realize Kizaru is not even there.
Kizaru has done all this while holding back. He has not even needed to try to clown on Luffy this bad.
1- "I thought I was going to die" does not mean "I almost died".
2-kizaru not falling into the sea is not a big deal, he can fly, he is the light itself, what did you expect to happen?
3- according to the summary luffy only got a small scratch just like rayleigh did to kizaru.
4- we don't know if he uses advanced observation haki, after all even acoc doesn't use it.
5- is kizaru holding herself back? I don't think so, she uses haki and her fruit completely, there is nothing to call feat in the episode, stop exaggerating.