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"Romano Fenati has been sacked by his Marinelli Snipers Team"
https://www.theguardian.com/sport/2018/sep/10/romano-fenati-sacked-brake-lever

I haven't tried it, but the butt brake lever seems to me to fit the application pretty well. Cyclists needing quick braking develop the habit of shift backwards on the saddle, or over the back of the saddle anyway. This helps to counteract the unweighting of the rear wheel that occurs with heavy brake application.

With the butt brake, an existing reflex is repurposed -- clever.

Yep, either a separate brake lever you can clip on and off or some way of hooking it into the existing brake system would be far better. Butts just don't have the response time, to say nothing of the ungainly pose needed.

An excellent idea for people who ride with their *pets, especially on hills.
An upgrade to this might be to make a flexible quick connection to the rear brake cable so it would just operate using the normal rear brake lever, although using your ass to stop is hilarious and fun.

I must admit, from the title, I expected something more like the flexigrip controls on Mr/s Garrison's 'IT'.

There is no way that bike could out-brake that truck. There's no way if the truck slammed on the anchors like he meant it that the guy could stop without hitting it. He has one finger on the brake levers. The first 0.2 seconds would be until he started moving. The next 0.2 seconds (the 0.2 seconds that would put him into the back of the truck) would be for him to get his fingers properly onto the levers.

All this is if he's extremely alert and fully focused as the truck started to brake. You can play around with the maths all day long, if that truck has to stop in a hurry he's gonna lose a huge amount of skin.