Yes I remember that was not just true of MoFi but also Nautilis and other that claimed to be using "virgin vinyl".
Now we get the 180-220gm pressing and they are not transparent and I never see the term "virgin vinyl" used in product description. I don't think that means that we are getting "nymph vinyl" it's just not a selling point, as it was years ago. Also the MoFi pressing of earlier days were not 180gm so with a lesser thickness maybe light passed through better. Just a theory anyway.
Now we get the 180-220gm pressing and they are not transparent and I never see the term "virgin vinyl" used in product description. I don't think that means that we are getting "nymph vinyl" it's just not a selling point, as it was years ago. Also the MoFi pressing of earlier days were not 180gm so with a lesser thickness maybe light passed through better. Just a theory anyway.