Yes those are the blades pictured and you make some very good points about the deck, and powering through tall thick grass- hadn't thought of that.
Yes, I knew there were no wings, and that is why "no lift" which I was questioning. Probably because of the points you mention, and as I later thought, these blades swing if they hit an unmovable object, pivoting on those bolts you see. If there was "lift" those blade might not swing, or bind on the bolts.
It is just that you don't get clean mowing when the wheels of the ATV and of the mower mat down the grass/weeds. Overlapping helps, but sometimes that is not even effective.
thanks for you comments and help,
Dennis