Small correction: the post says "2019 pandemic," but the pandemic was actually in early 2020. "COVID-19" is so named because it is traced back to a first case in China in December 2019. WHO declared it a global emergency on January 30, 2020 which is about when Western press started taking it more seriously. WHO announced "COVID-19" as the name of the new disease, following some international naming guidelines, on Feb…
When does a pandemic begin is sort of an interesting question. I agree when the virus is first seen is probably a bad date to use for historical context purposes, but I see the logic for it.
First cases outside China were reported in Jan. WHO announced the pandemic on Mar 11 and first related lockdown (outside China?) was announced in Italy 2 days later.