Think the turnout is down because the 2021 election was at the same time as most Kent Districts had local elections. All the elections due in 2020 had been postponed to 2021, for obvious reasons. This time, fewer Districts. Meanwhile, the winning candidate got less than 50% of the vote, so the gerrymander to go for the person with the largest number (even if less than half), compared to the previous system of supplemental vote, could have affected the outcome.
Think the turnout is down because the 2021 election was at the same time as most Kent Districts had local elections. All the elections due in 2020 had been postponed to 2021, for obvious reasons. This time, fewer Districts. Meanwhile, the winning candidate got less than 50% of the vote, so the gerrymander to go for the person with the largest number (even if less than half), compared to the previous system of supplemental vote, could have affected the outcome.