This is a bad faith article that would have ended the same either way. Right now western countries are getting taken to task for not approving the vaccine quick enough. Had they approved it quickly in spite of the blood clot concerns, the headline would be something like, "Wealthy Western Countries use Africa to test questionable vaccine" and there would have been references to Tuskegee and some such.
Everyone is in unknown territory with this pandemic and frequent judgment calls have to be made before all the evidence is in. Sometimes you get it right and sometimes you don't. But saying countries "ruined" an entire continent's chance out of the pandemic is blatantly dishonest reporting.