I do think the numbers are an actual scenario, just far removed from my own, so it makes them seem wrong at first.
The 20% away from home would be 2,400 miles in this scenario which is quite a bit, but not that far off for a Michigan-Florida trip for spring break or vacation.
$3.32/gallon is dated, but in the ballpark.
33mpg is reasonable for a smaller car as overall mpg.
3.9mi/KWH is accurate.
The 255 deadhead miles is kind of out there, but only adds $14.70 (which I can't recreate that exact number)
If someone buys a Bolt, buys a charger, lives in Michigan, has to charge during a long trip or 2, etc then yeah it's about right.
For my case, I come up with $3.62 for 100 miles including the new Kentucky $120 road tax and the fact I've never bought an EVSE and currently have 3 or 4, can't remember exactly.