I agree it does not use the words “human to human transmission”. At the same time, Taiwan claims that by calling it “atypical pneumonia” there was an inference

I agree it does not use the words “human to human transmission”. At the same time, Taiwan claims that by calling it “atypical pneumonia” there was an inference that human to human transmission was possible, or even likely, and so as a result the claim of “no evidence” by the WHO was overstated. Taiwan is likely also overstating their case. That being said, if the exact same information was passed to the WHO from, say, Germany, it is quite likely it would have been taken with more seriousness. Taiwan being excluded from the WHO to placate China is a bad thing if your primary focus is world health. Politics should play no part.