Interesting idea, but not a proper clinical study. HN doesn't seem like the right forum for this unless there are people who would initiate such a study.

The claimed mechanism is Polyvinyl Pyrrolidone or Povidone Iodine nasal spray can potentially bind with ACE-2 receptors preventing covid.

Is the Indian Journal of Otolaryngology and Head & Neck Surgery a high-quality journal? I couldn't even find an impact factor for it. The stream-of-consciousness unedited abstract does not inspire confidence.