Here's the timestamp, by the way:
Airi does claim that she herself hasn't spoken to "people" in a while, but we have still seen her interact with other Phase members on Twitter and seen screenshots of her interacting with people like Rie in their Discord. It wouldn't surprise me if Airi herself went no-contact herself, but she was dealing with a lot IRL, so that's understandable.
At face value, it's also not unheard of to not be in contact with friends or even family for periods of time for whatever reason, but considering how close we know these two are to the point that I'm pretty sure they've stated that they talk literally every day, this definitely stood out to me. It would have stood out to me even if I didn't have a negative opinion of Kelsey too because it seems a bit strange that Airi legitimately sounds confused over what Clara's situation is. It stands out quite a bit more because we do know that Kelsey has still been online plenty in this time.
Putting aside jokes, I'm not even trying to insinuate anything here. I know Clara announced she was going away, but if you look at Airi's chat during this moment, some of them are also confused about the situation. It definitely stands out that Airi doesn't even know. But, I'm sure things will go back to normal when she comes back, whenever that is.