Is this a plothole? Question about the Endless

[NishaSetsuya]

Gleaners are scholars too. He states that when he's attempting to get information from a Forum member as we're listening on as frogs. I can find the scene and take a picture for you if you don't believe me. Grief doesn't make you forget how your afterlife works. And he doesn't seem sad in that moment, he seems enthused. And again, half the evidence points to him possibly being right and the other half points to him being incorrect. I'm curious why people are so quick to discard the parts suggesting he's right given it was how we justified deleting thousands of people.

"Oh no, what Cahcuia said directly multiple times was incorrect, this was actually the only version of these people and they are now gone forever. Oh well."

His domain of expertise is nature and fauna, that why he is a gleaner. All the scholar in sharlayan have a domain of expertise not every one of them is knowledgable about aetherology.

Also i feel like those past expansion been about some of the stage of grief

Shadowbringer enial and Anger
Endwalker : Bargaining and depression
Dawntrail : Testing and Acceptance
(That my how interpretation of thing in relation to their last dungeon and zone. Similar but different)