No specific study was linked from the transcript. Brady's works indexed by Google Scholar there is "Misinformation exploits outrage to spread online" by KL McLoughlin, WJ Brady, A Goolsbee, B Kaiser, K Klonick, MJ Crockett, published in Science 386 (6725), 991-996. [1] Two of moral outrage's properties are interestingly counter to one another. Expressions of outrage are often orthogonal to truth/falsity and expressing outrage imbues trustworthiness.
[O]utrage expressions can serve communicative goals that do not depend on information accuracy, such as signaling loyalty to a political group or broadcasting a moral stance. Consequently, outrage-evoking misinformation may be difficult to mitigate with interventions such as fact-checking or accuracy prompts that assume users want to share accurate information.
[I]ndividuals who express outrage are seen as more trustworthy. This suggests that news sources might gain a credibility advantage by posting outrageous content.
0. https://scholar.google.com/citations?hl=en&user=ysiWkJMAAAAJ...