The Company you're referring to, CytoSorbents, makes a blood purification device. 4 Companies have received EUAs for such devices, each authorization using similar language to "There are no FDA approved, licensed, or cleared device treatments for COVID-19. Based on bench performance testing and reported clinical experience, FDA has concluded that the CytoSorb device may be effective at treating certain patients with confirmed COVID-19......"
You "could not find the specific clinical trial referenced in the pr" because there wasn't one. The CTC Registry referenced in your link is a different animal.