, well known, and I described it upthread. Nothing you've done has even beg un to contradict what I said.
Capacitive 'non contact' volt detectors measure the voltage between their d etecting tip and the field around them. When a human holds the thing, the h uman's stray capacitance keeps them not far from 0v, usually. In which case the detector works fine.
But if the human is off the floor and say leaning on a mains wire, or a wal l with a wire under the surface, human can be at higher voltage. If human v oltage goes high enough, they are near live voltage, albeit at minimal curr ent via stray capacitance. In this situation the capacitive meter will give inverted readings, live gets reported as ground and ground as live.
Wrapping yourself with a live wire raises your voltage, but to what extent we don't know, as we don't know human to wire capacitance or human to surro undings capacitance.