This myth was disproven by Andong on YouTube. He found a NYTimes article from 1975 about sushi in Japan that included salmon.
Watch here: https://youtu.be/1k4x9FrD5k4?t=668
Edit: Andong also specifically talks about the Nichirei deal.
Watch here: https://youtu.be/1k4x9FrD5k4?t=668
Edit: Andong also specifically talks about the Nichirei deal.
Right, but if it's casually being shown on nytimes it's reasonable to infer that it's at least somewhat mainstream?