I mean not necessarily. Road bikes pretty much never have any actual suspension, all the comfort comes from tire and frame flex. This bike has some fairly chunky tires on, and the way the seat post is just suspended off the back I’ll bet that frame flexes a ton.

That being said, you’d still have to fine tune the design, and get the right amount of flex in the right ways. I kinda doubt anyone choosing to make a bike like this would have the competency to do that