I have a problem with the method so far(from the "study of daoist accupuncture", but it seems in all other sources as well).
From what I see it seems they are using Stem and Branch of the year.
The problem with that is that all maps we can see will be exactly the same as 60 years ago. So 1960, the map is exact as 2020. And 1959 same as it was 2019.
And in both years there was no big epidemic at all. There is no info for small ones either. Here is a list we can use to check:https://en.wikipedia.org/wiki/List_of_epidemics
2,720 United States of America 1949 Poliomyelitis 
3,145 United States of America 1952 Poliomyelitis 
2,000,000 Worldwide 1957–1958 Asian flu Influenza A virus subtype H2N2 
Worldwide 1961–1975 Seventh cholera pandemic Cholera (El Tor strain) 
500,000,000 Worldwide 1877–1977 Smallpox 
1,000,000 Worldwide 1968–1969 Hong Kong flu Influenza A virus subtype H3N2 
5 Netherlands 1971 Poliomyelitis 
There are some that end 1958, and one start 1961, but exactly these 2 years there was nothing.
And the map should be the same as last year and the current one.
Suggesting that whatever is used to predict what is happening now and what happened in the past decades it can't be this. It needs to have location and it needs more then stem and branch of the year, as if we only use this either we will expect a pandemic 1959/1960 and there will be none, or we will expect nothing now and we will be surprised.