I know it's rude but I basically just don't believe this is a real thing. The emperor may or may not have clothes but at least an outside analyst (a child, traditionally) can look at him and decide one way or the other. But everyone who makes claims to be able to do the Jhana thing is just saying stuff about their internal state, without even as much potential evidence as people who spend their lives claiming to be able to do telekinesis or clairvoyance.
I know it's rude but I basically just don't believe this is a real thing. The emperor may or may not have clothes but at least an outside analyst (a child, traditionally) can look at him and decide one way or the other. But everyone who makes claims to be able to do the Jhana thing is just saying stuff about their internal state, without even as much potential evidence as people who spend their lives claiming to be able to do telekinesis or clairvoyance.