Ivermectin doesn't kill viruses. It might lessen a few of the symptoms of co-infections that somebody might feel that developed out of covid but it is not getting rid of the disease at all. The same way some people take antibiotics to blast out co-infections that originated with a virus. They shouldn't do that with a common cold because it can lead to antibiotic resistance but it does make them feel better even if it doesn't get rid of the virus.
But hospitals already know this and if it would have been effective with covid they would have done it.