Except qi does not cause mass epidemics... sans the ones our minds create. There's no reason to codify "liver yin deficiency pattern" in a scientific taxonomy. The author notes how it might be useful for research and historical purposes. There's no reason to affirm unscientific beliefs within science. I'd rather the person in charge of my health only use science and nothing else. There are 14 000+ entries in ICD-10, according to (citation-needed text from) Wikipedia. Most of the lists I find online median to about 20 silly entries (like your "bitten by a cow"). 0.0014 is a decent margin of error for such a titanic amount of work.By your argument, John Snow was a pseudoscientist.
After all, The ICD has been a staid and respectable body of terminology so far.