Then to say it is a 'hypothesis' is wrong, since a hypothesis is a part of the methodology and implies something about the investigations into whatever the hypothesis is about.
From the dictionary...a Hypothesis is....
"a proposition, or set of propositions, set forth as an explanation for the occurrence of some specified group of phenomena, either asserted merely as a provisional conjecture to guide investigation (working hypothesis) or accepted as highly probable in the light of established facts".
To explain the occurrence of NDE's, one of the valid hypothesis would be the existence of an After-Life...just as brain induced hallucinations could be another. The hypothesis thereby is a conjecture that guides further investigations.
Dismissing the After-Life as a religious belief in spite of widespread experience of NDE's....is clearly wrong and does not help in further investigations.
Only people who out of vested interest, don't want to investigate NDE's as possible evidence of an After-Life would deny that it is a hypothesis.