No, a super charging station can slower charge a bank of capacitors. No substation necessary. The amount of time it takes to pull out and pull in a fresh car & hook up doubles the real world time, while your active charge is about 12 minutes.

It seems to be designed to pump out 60A at up to 800V.

So a 600A service is pretty common at 480V for commercial buildings (you can get more I'm just saying this is a really common service). A capacitor bank and a good control unit should make light work of it.

Keep in mind doing fast charging is super bad for your batteries. Also at a local grocery store that has a super charger (they advertise) using that feature costs a few more bucks I'm assuming to discourage it, possibly to get you to shop there and wait longer.