Okay, I’m starting to question if you’re even reading the articles you’re bringing out here?

with the proportion of each reaction among disgust reactions similar to that induced by bitter and sour stimuli

First link states in the abstract that it isn’t measuring a pain response, the paper goes on to clarify that (and has some pretty horrifying descriptions of the surgical procedure…)

The second is studying the LD-50 of capsaicin - and yeah I bet they had a pain response, since they were given so much of it some of them died of stomach ulcers. It does not at any point discuss the pain response from consuming it, beyond that they died. These are both fundamentally irrelevant to the topic at hand.