I could not find anything published under this name or title. The first four hits that came up were YouTube links, which is not reassuring. Perhaps you could provide a link to the peer-reviewed journal that has published this research.
Meanwhile, there is this: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7246103/
"There is no strong scientific evidence to show that very high intakes (ie, mega supplements) of vitamin D will be beneficial in preventing or treating COVID-19. (5) There are evidenced health risks with excessive vitamin D intakes especially for those with other health issues such as a reduced kidney function."