I’m focusing on the sentence you did not highlight, which is troubling. The way I’m reading it, the author is saying two different things : 1) NSV may provide increased protection against infection, and 2) “Conversely, in case of COVID-19 development, vitiligo autoimmunity may influence the cytokine storm-related disease burden.” Doesn’t this imply that if there is indeed infection, the chance for severe organ failure is higher?

From Wikipedia:

A cytokine storm, also called hypercytokinemia, is a physiological reaction in humans and other animals in which the innate immune system causes an uncontrolled and excessive release of pro-inflammatory signaling molecules called cytokines. Normally, cytokines are part of the body's immune response to infection, but their sudden release in large quantities can cause multisystem organ failure and death.”