This tech is advancing pretty quickly. It's not going to be long until they have it perfected.
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I agree the tech is advancing and will only get better with time.
But even when it's 'perfected' it still won't be hard at all to spot it. Even if you don't bother with a forensic analysis of the video which will spot it in a heartbeat. There are many factors that won't line up such as height, weight, birthmarks, tattoos and not to be crude but the size and shape of the penis or the size and shape of the breasts.
The video in your post is really remarkable, but I can spot differences between a horse and a zebra without a comparison picture to match it to. Zebras have a much more pronounced barrel shaped abdomen than a horse along with a shorter muzzle to name a few.
And I don't believe anyone would get away with making one of these fake videos and trying to use it in a divorce. Too many questions to be answered... not to, once again, mention forensic analysis. (that doesn't mean some idiot won't try though.)
I suspect this will stay in the porn realm or perhaps the comedy realm.