It sounds very... Odd? Basically they asked questionnaires to two totally unrelated groups (people who took DMT; and people who had NDEs in the past) and then did some ANOVA magic in SPSS and decided that they were related because people score similarly on a quiz? I'm a bit confused by how reliable this method would be. Also the sample size < 20 seems questionable to me.

But this is just me with very little statistics experience so I am probably wrong in all these thoughts. And there's probably someone way more knowledgeable who can give a better opinion about the research methods and results