This paints a rather colored picture. The initial advisory from 14 Jan 2020 [1] presents their case that
"Based on the available information there is no clear evidence of human-to-human transmission."
The reader can decide if that was a fair assesment at the time. The text was followed by
"Additional investigation is needed to ascertain the presence of human-to-human transmission, modes of transmission, common source of exposure and the presence of asymptomatic or mildly symptomatic cases that are undetected. It is critical to review all available information to fully understand the potential transmissibility among humans."
A week later, on 22 Jan 2020, WHO followed up with a confirmation of human transmission [2]
"Data collected through detailed epidemiological investigation and through the deployment of the new test kit nationally suggests that human-to-human transmission is taking place in Wuhan. More analysis of the epidemiological data is needed to understand the full extent of human-to-human transmission."
(Of course it was impossibly to deny that by then, since Wuhan was locked down the same day.)
In my small European countries, no public measures were taken based on all this info until early March (more than 2 weeks after Northern Italy was overwhelmed, while our countrymen had been traveling all over Europe), because there were no confirmed cases in our country yet. The only initial measures in early March were advices to "wash your hands", "don't shake hands" and "sneeze in your elbows".
So I don't think the WHO confirming human transmission on 14 Jan instead of 22 Jan would have changed a thing. People only take painful measures when bad things happen to people they know, and politicians only when bad things happen to people in their own country. Trying to shift the blame on the WHO or China is not very common amongst politicians here (though anecdotally it's not rare among citizens), that seems to be mostly an American (specifically, Republican party) thing.
[1] https://www.who.int/csr/don/14-january-2020-novel-coronaviru...
[2] https://www.who.int/china/news/detail/22-01-2020-field-visit...