There are some possible explanations for red chili peppers’ health benefits, state Chopan and Littenberg in the study. Among them are the fact that capsaicin – the principal component in chili peppers – is believed to play a role in cellular and molecular mechanisms that prevent obesity and modulate coronary blood flow, and also possesses antimicrobial properties that “may indirectly affect the host by altering the gut microbiota.”
The vagueness and intellectual cowardice are exasperating. Don't be afraid to call it out when correlations are two-a-penny and funding is at stake. There are problems crying out for research.
There's no contradiction between fallibilism and asserting that some scientific explanation is true. This study doesn't assert anything apart from an 'association'. Yet progress is made by addressing theoretical problems, not by looking for assocations, which are everywhere.
As for 'propaganda' I think you've got it the wrong way around. It's the people who applaud this kind of non-result who are seeking a kind of uncritical 'Yay Science' experience.