Earlier quoted context omitted.
Because voting results are universally reported as percentages, that's what everyone uses and understands.
No, they are universally reported in raw numbers accompanied by percentages, as indeed they were here. The raw numbers are universally understood to be derived from the percentages and not vice versa. The votes are the ground truth. That's how elections always work. The votes are what counts, the percentages are an abstraction to make the votes easier to parse. Any government agency that doesn't operate that way does…
No one is saying that the percentages are not derived from the raw tallies they are saying that it might be that somewhere in the game of telephone to the person that goes on TV and reports only the percentages were communicated and they realized they should put the tallies in too so they imputed them from the numbers they had, the total votes cast and the percentages (and naively it seems obviously okay to do that).