shrug. good for them.
I've had two retuls and both fitters came up with different assessments. Therefore I'd still put it on the fitter who needs to place the sensors properly and analyze the data. All in all pretty cool technology, but certainly not the end all be all.
Your premise is also more an attempt at argumentation than anything significant. Because a pro does something one way it doesn't invalidate other methodologies. Your assumption is that using one particular method necessarily produces different results than another, and of course you don't really know that.