I used the ruler to measure the width of my palms, they add up to 180mm (90mm palm width is pretty average).
Consider the entire width of the keyboard is 215.9mm, the space between key "a" to ";" will be even smaller. From the scale of the photo, the space is approximately 150mm. I put my hands on the resting position for touch type and try to squeeze the fingers into 150mm of space. There is hardly any space.
So the folding keyboard is not going to be comfortable for normal hands.