Tldr; it might help to take zinc.
Out of 249 studied patients, there was 8% (21 patients) mortality. The investigators found a significantly lower plasma level of zinc in COVID-19 patients who died (43 μg/dl) than the patients who survived (63.1 μg/dl). After adjusting different variables, the investigators showed each unit increase of plasma zinc at the time of hospital admission resulted in a 7% reduced risk of in-hospital mortality.
Zinc deficiency increases the risk for all sorts of infections, as the article states, including COVID-19. But this is nothing new: keeping a healthy, balanced diet and getting enough of all nutrients is important for everything in health.