It's absolutely accurate. But no real hacks needed. Yagi antennas and boosted interfaces are now common. In lots of commercial WiFi appliances, power is softwa

It's absolutely accurate. But no real hacks needed. Yagi antennas and boosted interfaces are now common. In lots of commercial WiFi appliances, power is software-defined. And norms have their own power index. Values can be tweaked using free software solutions/a bit of magic. In addition with networking technologys, power amplification,... It's totally legit, quite accurate, and underestimating the reality.