Looking at the pic RPO83 posted in the other thread, it seems it's still connected at the top of the spindle with a rod (one connection at wheel, one connection at chassis), although not like a triangle (one connection at wheel, two connections at chassis) as a wishbone would be. There still seems to be a lower wishbone. If there wasn't any "control Blade", (which I am assumong is the red thing pointing out the front) then there would be lots of unrestrained transverse loading, but the 'blade' should alleviate most of that. I'd say that it's as strong as (or stronger than) the double wishbone setup.
After the whole Mr Informer thing, I don't want to assume that everything on these forums is accurate, but RPO83 did quote,
"Handling has always been a hallmark of Falcon, but the new Control Blade IRS raises the bar to new heights."
Although I know RPO83 has been accurate on many things.