Sorry for the late reply: I don't see how it would prevent infection. It could be useful post-infection, to prevent complications and inflammation. Compared that with the standard of care right now which is simply observing the patient during their recovering.

There are a fair amount of studies who took the initial in vitro results (i.e. cell culture) suggesting non-specific antiviral activity (at that level coca-cola is also an antiviral, antimicrobial, and antitumoral, by the way), into animal or human, and they just did not pan out, because it isn't an antiviral.