Math is cool. So are details and examples...
Unfortunately, the OP has not provided much beyond the basic cost of whatever kind of charger that is (?) and an estimate of charging time to fully charge to 100%... Apparently failing to consider that charging (or at least fast charging) slows wayy down after 80%... to protect the battery from being damaged via possibly overheating..
According to the globeandmail.com, a fast charger can recharge an electric vehicle to 80% between 20 and 45 minutes.
To be fair idk what kind exactly that is in the OP meme.. But if it is a "fast charger"...... I mean 80% "full tank" for less than $20 seems pretty good.
Also I could be wrong but gut feeling... I tend to think it would be a "fast charger" because idk how many people would actually be willing to sit around waiting at the station 6+ hours to charge their car. Idk. Tell me I'm wrong.