yes, it has killed those types of beings in the past but it doesnt say how and in what context (hyperbole).. i would assume well placed hits would be the deciding factor in its past fights not its hyperbole.
so again i ask you who has it killed or more specifically who has she killed with it?
saying it can kill thanos is a bold claim if your basing it on the hyperbole titan claim b/c their is actually varying degrees of titans from alien/human type beings to mythological ones and it sure didnt say hey this knife has killed titans from saturn and immortals from earth that have regeneration abilities and even the ethereal type ones as well ..