As I understand it, the recordings are just being shown as crickets. They are not disputing that the medical issues were not real, just that this piece of evidence was crickets. That doesn't mean they are saying that the attack was crickets.
That was a fiction to fit the narative anti-normalisation proponents such a Rubio wanted to push.
https://www.vanityfair.com/news/2019/01/the-real-story-behin...