Trump expands battle with World Health Organization far beyond aid suspension

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25. So we can argue about the date of most significant declaration by WHO

From the link presented by you, the first date of significant announcement by WHO was:
"• The outbreak was declared a Public Health Emergency of International Concern on 30 January 2020."

And then the next date of significance was on March 17 from the link I had furnished, when WHO declared covid-19 was declared a pandemic by WHO.

The other date is Jan 13, 2020 for a single case confirmed in Thailand.

The way I look at this covid-19 is that it was a brand new virus, no one really had any existing knowledge or experience with it.
No one except China had the slightest knowledge on Jan 13, 2020 how lethal or contagious covid-19 was.

Based on one case confirmed in Thailand, why would any country take drastic actions on Jan 13th, such as banning travel from China?
Actually even after on January 30, 2020, when the outbreak was declared a Public Health Emergency of International Concern,
president Trump's action of banning travel from China was premature. Neither he or anyone of his medical advisors had a clue on Jan 30, 2020
how lethal or contagious covid-19 was. Banning travel from a major country has serious economic consequences, and therefore Trump's action on Jan 31 was a risky move at best.

Even if any pandemic is determined to be serious or not in terms of deaths, it still causes a lot of serious effects for people who get infected. Even the ordinary influenza and common cold causes one to take days off from work and be miserable at home.

At end of day, all countries depend on WHO to ring the bell loudly when any infectious disease rears it's ugly head. Whether WHO's actions regarding covid-19 were timely will be open for debate with opinions running all over the map.