Bell-Weather Counties in Presidential Elections 1980 to 2016 Were 190 Wins & 0 Losses But After 2020 Fell to 191 & 18

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The most telling simple indicator that the 2020 election was rigged is that 19 bell-weather counties for 10 consecutive elections (1980 through 2016) were won by whom became president, en toto 190 wins to 0 losses, but the eventual “winner” Joe Biden in 2020 lost in 18 of those 19 counties, so how do you explain that without election rigging (particularly in swing state urban areas)?