I personally doubt that its accurate to say "80%" as that doesnt apply to the world. However, if thats what theyre saying, that means none is really telepathy. Its the same as looking at a painting, and saying "I feel the artists was going for (x) in this painting" and it turns out you were right. Thats not telepathy, but only general observation. as for the "lie" detectors, thats also observation, and would only apply to various subjects.
Telepathy has unfortunately remained elusive when it comes to evidence.