state of the art deepfakes are pretty much indistinguishable from reality
Even if interviewers don't suspect deepfakes, the audio artefacts of deepfakes (odd intonation, mispronunciation and pauses) are going to sound suspiciously like someone who isn't very confident in their answers or is bullshitting. Much easier for poor English speakers just to draft in a person who speaks better English and maybe knows more about the actual work for the interview...
You dismiss people who fall for this as bad interviewers but I don't think you appreciate how sophisticated fraud has become-- with teleconferencing (anything internet-based, really), you never truly know you're interacting with who you think you are. You may not find out until they've collected a few paychecks, made copies of all your IP and disappeared into the night.
Any company who is hiring off the internet, internationally, on the basis of a deepfake and a resume and is granting them elevated access to client PII on day one deserves to be exploited and deserves to be sued by their clients.
There are a lot of dumb middle managers out there. In some cases, the position and the intelligence are co-dependent, I suspect. It's truly terrifying, if you think about it.