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I find the suspension design to be really interesting. It seems like the front wheels and the rear wheels each share a single coilover and they use hydraulic cylinders at each wheel to transmit the force. I'm sure this saves a lot of weight but I'm interested in how the suspension dynamics are changed by two independent wheels sharing the same spring and damper.

Do any other vehicles do this? Are there are any other applications where it would make sense?

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This is actually fairly common in Formula Student cars. They often use decoupled heave/roll suspension systems, where one spring/damper is for the heave of the entire axle and another one for the roll on the axle. It has some advantages over separate springs, but I'd have to ask our suspension guys.

The graphics in this article show its function fairly well, but don't explain the calculations either

https://www.marekdostal.com/suspension-design/

Recently, some teams have added the hydraulic relocation of dampers, and some (like Dresden) even have software control of them.

Isn't the go-kart suspension still somewhat competitive, though? I'd heard of teams that have suspension travel for passing tech and then jack up the rates afterward.

Yes and yes

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