You are correct. Those poles are floating in the air not connected to the corners directly.
The idea of freeestanding is to be able to set the shelter up and move it about but you still need to peg it down.
That gives you a bit of latitude on where to insert the stakes and or use ballast or guylines to keep it on the ground.
(A common mistake that people make setting up tents (and tarps...) is to get the angle of the tie-out pegs wrong. This is not so important with freestanding shelters.)
A mate has just used my Moment with the somewhat similar freestanding option, he did that because he was camping on rocks on an island on Lake Huron. To keep the tent in place he piled rocks on top of the end guylines.
Do keep in mind that a lot of "freestanding" tents need more than 6 pegs to keep the fly taut, if you really want to you do not need any stakes with the Scarp, just weight inside and no gale force wind to turn it into a kite.
BTW, Henry has been granted a patent on that cross pole with embedded support for the freestanding pole and inverted V corners.