I personally feel that the placing of the probes and the users experience determine the accuracy of the picus.
I also believe that the banter about it's inaccuracies is spread a lot further than it's accuracies ... to the point that many of the published results are held in negative context by those not willing to either accept or pay for the technology. In simple words, all the good tests and accurate tests dont get the attention but the bad ones do.
What a lot of people have trouble with is life ending ... when is it time for the tree to go, when it's fallen? Or when with current diagnosis it's believed too hazardous to stay etc.
The pruning and reduction is only further detriment to the health of the tree, yes it reduces likelihood of blow over however reduces the trees vigour which in turn allows the fungus to spread easier. The cycle of decline.
Personally, pay ya respects and out she comes is my opinion, all things end eventually. But the counter argument is with careful monitoring and works it could be there another 30 years .... and then it comes out.
Bite it now, or bite it then, either way she's a dead duck.
