how much do fear death experiences Undermine near death experiences?

fear death experiences are where the person doesn’t die but is majorly scared. they say these experiences, if i’m not mistaken, can be the same as NDEs where the person actually died.NDEs have solid evidence for their authenticity both philosophically and scientifically, see ‘evidence of the afterlife’ by doctor jeffrey long. but FDE the person didn’t actually die, so isn’t the authenticity of the death version compromised, and how much?