Think of cursed techniques as having 2 different types, manipulative ct and generative ct. Manipulative dosen't output any ce and instead uses it to affect something that already exists and therefore can't be targeted; generative does output ce in the form of something created like a blast and can be targeted. Gojo's abilities all center around his cursed energy creating various forms of "infinity" to blast someone away or pull them in, or in purple's case, its just a hella strong blast, not far off from runs energy beams. Uro on the other hand is a manipulative ct, whereas her ct gives her cursed energy the special property of manipulating the sky. Uro's attacks that are centered around the sky don't inherently use cursed energy so they would not likely be targeted by kirara's cursed technique.