The bike is not here, but there is a basic design flaw. If you draw force vectors/or show a string tangent to the chain ring and to the axle you can see the angle of dropout slot to string. If the up side of that string/dropout angle is acute, the chain pules the axle into the dropout. If it is obtuse, the chain tension will pull the wheel out and clamping tension matters.

Of course two extremes are the old slotted dropouts where wheels had to stay in place near 100% based on clamping pressure and track/TT slots where the wheel could slide, but was never going to come out.

So long ago I made a video to test this using un-clamped skewers. Venge - wheel pulls out. This is as unscientific as my wheel testing videos but it does confirm that the wheels needs that clamping force to stay in. I assume they did this for wheel change benefits. https://vimeo.com/127089488