Something I haven't figured out.
Look at the Helix in folded condition.
You'll see a straight line between the front fork pivot, the wheels axle centerline, & the swingarm pivot. This means that there's a lot of vertical compliance in the 2 connected wheels. If allowed to move upward from this position, the high leverage would impose potentially damaging loads on the pivots. That wouldn't be acceptable, so it must be a solved problem.
What keeps the wheels in place?
Does the swingarm touch the bottom bracket in this position?