I wasn’t able to read this article (seen here), but it sounds like those studies weren’t done well:
Targ and Puthoff “imagined they could do research in parapsychology but instead dealt with ‘psychics’ who were cleverer than they were”
There’s a page on Wikipedia that has a little bit of information about what went wrong:
“…when the cues were eliminated the results fell to a chance level.”
I’d recommend watching this video. It goes into some of the techniques that charlatans use, and mistakes that researchers make.
(Also mentioned here.)