When I first heard about the boring company I understood that they were planning to make electric sleds sort of like a car wash so you don’t have to steer and d

When I first heard about the boring company I understood that they were planning to make electric sleds sort of like a car wash so you don’t have to steer and didn’t propel entirely from your own engine. Later reports made me think this wasn’t the case. This video makes me think my earlier understanding was correct. It doesn’t look like the person is steering (and it would be quite dangerous to require them to). So how does this work?