We're not claiming anything, just stating a fact. Admiral fanboys however are saying that Kizaru was able to block a AdCoC attack without using haki himself & indirectly staying Luffy's haki isn't strong enough to do anything to someone not using haki at all.
On the other hand the sensible folk know it's CoA, just like during his fight with Katakuri. In which both combatant were streaking all over the place, without being AdCoC users themselves