Well a quick look around, Wikipedia shows the Dallas County 2010 census at 66M people. So JW’s population of ~80M definitely is accounting for population growth. Side note, Dallas County is decently heavily Republican, so that’s an oddity, usually these kinds of issues show up in Dem-heavy areas.
So, the off-set numbers have to be from the registered voters lists, and those look close to me. Pate’s official website’s pdf numbers show 62,825 registered voters (Dallas County). A total population of 80M should give about 60M registered voters. (US is estimated 245MM/323MM for 2016, or 75.8% of the population being voting-age.)
So, just a quick look and I’d say JW’s percentage of 114% registered looks decently accurate. Maybe a little high, but it’s definitely not even close to the 70% average across these US. It’s far enough from the national mean to definitely warrant a closer look.
Less than 39,000 voted in the 2016 election.
Census Bureau says pop. 90,000+ in mid 2019, with probably 60,000 voting age. Adding about 3,000 people per year. Paperwork can’t be easy to keep up with.