This type of extreme driving was expected for the Bolt EV. Yet in 2015 someone drove a Chevy Spark EV for 138 miles on a single charge, doing something similar. The main points to be seen here are:
1. EVs have better ranges at lower speed.
2. Hypermiling always save energy (gasoline or electricity).
I used to hypermile in my 1995 Buick Regal which had a EPA rating of just 18 MPG. I did pass 24 MPG many times (a 50% increase!) and I bet many here will never improve their MPG in a gasoline car that much. My favorite method was to predict any traffic slowdown, shift to "N", and coast to a stop. Keeping the gear in "N" at every stop saves gasoline (no need to brake against the engine loading the transaxle), giving me better MPG, longer engine and transaxle lives, and less brake pad wear. It is more intelligent driving than true hypermiling.
But it is well proven by thousands of Chevy Volt, Spark EV, and Cadillac ELR owners that all can get much better EV ranges than the EPA rating will little effort or special driving. Now, this case had a 95% range increase, which is excellent but impractical. Expect 300 mile ranges every day from regular Bolt Ev drivers.