Nice design, and saving water is always good.
However, a large sliding seal like the one needed inside this unit is the worst idea ever since the invention of the flush toilet.
And all the while not taking advantage of the only other potential benefit such a design could have: Using the space when not using the toilet. Shape it so it can be used as a seat when the toilet is flipped up.

I concur. moving parts in the drainage plumbing = job security for plumbers.

Is there actually demand for a folding toilet? I have lived in places with tiny bathrooms, but all were very low rent places, and this does not look cheap. If they really wanted to make something useful, a self cleaning toilet is a winner. Nobody likes cleaning toilets.

I think the concept is very good. It would be excellent for ensuite bathrooms where space can be a problem. I do however have a concern with the design. The gap at the back where the wall and floor join could be a real grime catcher. May I suggest that the design sit flush with the wall so there is no space. Water, dirt (and whatever) could collect after time and create quite a health hazard. I also agree that if the 'top' could be redesigned so you could use it for a seat or to temporarily put things on it, this would improve the usability. Good luck with the plumbing!

Agreed, the air-tight seal is absolutely guaranteed to wear out with rather unpleasant results.
Also, the design requires twice the water usage than that stated because there would be the overwhelming desire to pull it down again to use the toilet brush and thus ensure that one had not left a record of one's 'performance' on the throne, to put it as delicately as I can, or less delicately: WTSHTP.

This will be rejected by many people because you cannot flush while sitting on it. The seal is a big concern. What happens when the pipe clogs during a flush? The waste valve makes it impossible to use a plunger or drain snake. Now a tankless toilet that sits next to the wall that would be a winner.

pardon my language, but that tight u-bend looks like a bottleneck for any large floaters

I don't want to have to touch a toilet, these toilets need to be designed better for men to use.

Interesting. But I can think of some major problems and concerns, some are mentioned by others here.
Plus, I can't see any need for this.

Sorry, the idea is false. When you pull it down to sit on you still need as much room, probably more because of the design. So it doesn't really save space and probably takes up more.
Second, as people have pointed out you need to touch the toilet -- the trend is now towards auto-flush toilets where you don't need to touch.
Finally, it would be a real problem when you pull a muscle in your back - you can't even flush it until you fold it back. A problem for the elderly and kids too.