If it is against the wishes of the people in the video, yes, yes it is.
E: Never thought I'd see the day I'm downvoted for saying un-blurring porn of people who made porn under the assumption that it would be blurred (and may not have made that same decision without that context) is unethical, on HN of all places, but times are strange I guess.
The reason it's "against the wishes" of folks in a JAV video is because of the legal risk it opens them up to from the Japanese government - not because the actors/actresses "don't consent to viewers seeing their uncensored body".
Note that I am NOT talking about distribution of non consensual deepfakes. Obviously that's abhorrent.
How can you possibly know this? They made the career decision while knowing what the law was. They may not have made that decision if the law was different.