Mass Covid Tests Purchased since 2017, WEIRD

Worth the watch, no tests purchased before 2016 for something was created in 2019??? What are we missing? Why would so many countries start importing and exporting medical testing kits for something that didn't exist for another 2 years..... Link below
https://wits.worldbank.org/trade/comtrade/en/country/ALL/year/2017/tradeflow/Exports/partner/WLD/nomen/h5/product/300215
video of grenades being purchased for covid 19 in 2016 below
https://rumble.com/vo1k3q-government-looking-for-grenades-in-2016-for-covid-19-response.html