For another chuckle google how allopathic treatments for that flu lost 30% of their patients whereas homoeopaths lost less than 2%
If your only tool is a hammer every problem looks like a nail.
20 years of experience as a homoeopath taught me there are feasible alternatives to many illnesses.
During the 1918 Spanish Flu global pandemic there was no vaccine available but I imagine there were homeopaths even then. That would make comparisons to flu vaccines introduced much later very difficult.