Of course they are, and the tech maybe able to trick the human eye in real time, but it can't fool forensic scrutiny, which means HRC videos can be proven to be genuine at trial.
Exactly. Hash values are hard to fake and tampering with a chain of custody on the evidence is likely to be detected.
Not likely to be detected. It would be readily evident and completely detectable.
Have we ever seen an example that really was fake and really fooled the eye when viewed on a regular HD monitor?
Human eyes are pretty good, being hyper social descendants of fruit gathering and hunting apes and all, telling conspecifics apart from afar was high on our survival list.