I believe they are prepping it as a nasal spray to kill the virus in the upper respiratory tract before it drops into the lungs.
Which seems like a good way to prevent covid pneumonia
A half measure. Directly breathing ozone kills in the nasal passages, throat, and down into the lungs. That’s what I did in early 2020 when I had covid. And yes, can be dangerous if not used properly. Just like a surgeons scalpel. Can do wonders or make a bloody mess.