An easy fix?
"increasing numbers of complaints relating to the use of deepfake videos during interviews for tech jobs that involve access to sensitive systems and information"
Even in the absence of deepfake tech, you'll never know whether the person at the other end of zoom is the person you should really be talking to. So make a physical face to face interview a mandatory part of the recruitment process. I'd never engage even a commercial subcontractor without having a real physical meeting (preferably on their premises).