All it does is prevent the overproduction of stomach acid, I'm not sure how this could be of benefit, but then I'm no doctor.
It's less likely to be snake oil - as it created a statistical anomaly that they could track back to it's use. (In patients who didn't get as sick or survived Covid -19).
You DID take note that it IS a Histamine-2 blocker, in other words an Antihistamine, NOT an Anti-Viral medication, etc.?