So far, the best anyone's been able to really establish is that, under
some conditions, a good multistatic system can act as a very general
early warning radar against good stealth airframes, but not enough to
manage specific targeting solutions. Mostly due to detecting the
turbulence in the air well after a plane flies by...

There is absolutely nothing to do with turbulence.(Turbulence story again is
created by the Brits a couple of years ago as part of the disinformation
package to hide capabilities of their own system)
ALL modern multi statics use forward scatterers from target (passive stealth
platforms are designed to eliminate backscatterers and atmosphere is full of
man made EM waves) for target detection,tracking and imaging purposes.

Yes none of them have able to demonstrate such capabilities to public,because
the air force,only official user of stealth platforms in US,showing cold
shoulders to Mitchell style Stealth vs Multistatic demonstration idea.(I think
they already know something about the outcome of a such demo.)

a good multistatic system can act as a very general
early warning radar against good stealth airframes, but not enough to
manage specific targeting solutions. Mostly due to detecting the
turbulence in the air well after a plane flies by...

A good multistatic is able to detect and track targets
as small as a grain of sand at distances around 600 miles.