The point is that if you have a parasite infection, treating that is a good idea. If you don't, then treating it will not help you.
If you want not to die from COVID-19, getting fully vaccinated is the way. If you want not to catch and spread it (vaccinated or no) wear a mask when you might be exposed or expose others. If you can't get vaccinated, anyway do things to be healthy -- treat any parasite infections, eat well, sleep well, eat well, exercise.