Those votes in Virginia were switched right on the TV screen. Va. was called for Biden with less than 1% of the vote counted. Somewhere around 65% DJT was up by 8 points, An hour later Biden took a lead and DJT had less votes than he did earlier.
I remember watching Virginia in 2016 and it was very similar. Everyone said the big jump came from Northern Virginia being counted, but it happened really fast. Wouldn’t surprise me at all if Virginia was stolen in 2016 as well.