Different research teams sequenced the whole genome of the virus that causes COVID-19, consisting of almost 30,000 base pairs. Because this size is too big to sequence at once, the researchers independently amplify small overlapping fragments covering the whole viral genome. These fragments are later assembled, like a puzzle, based on their overlapping ends. The result is an accurate reconstruction of the entire genome of the virus."

So, within the fact check, they admit it's a reconstruction.