Is there any other case where a video has been so thorougly debunked yet is still claimed to be real?
I don't know about video, but Timothy Good, author of
Above Top Secret, still seems to think George Adamski might have been involved with something extraterrestrial. Billy Meier still has supporters, despite being a hoaxer (and appearing to hold, IMO, unpleasant political/ religious views). Wouldn't be surprised if "the surgeon's photo" continues to be used in online articles about Nessie.
Once an extraordinary claim about UFOs or paranormal phenomena etc. is out there, it seems to take on a zombie existence: It might be comprehensively debunked, but it never seems to "die".
Many people down the rabbit hole seem quite comfortable there.
They want to
believe (and those getting revenue from promoting unusual claims- even debunked claims- want others to believe);
us Metabunkers want to
understand. (I think!)
When an extraordinary claim is debunked (or confirmed) because we understand the evidence, like with the faked MH370 "footage", I guess we have to hope that it might help some people clamber out of the warren of deception.
Maybe some people who might have been persuaded to believe a falsehood (and therefore the people who manufacture/ propagate falsehoods) get to see that there is a different explanation, hopefully one that tallies more with objective reality.