[Formendacil]

The quote in question isn't from the HoME, but from Unfinished Tales, unless I am vastly mistaken. From the section on Nimrodel in "The Tale of Galadriel and Celeborn", possibly a footnote. (All that is a guess... I could be way off.)

However, I am quite certain that I am NOT way off when I say that nowhere ever printed or referred to in print, did Tolkien EVER write anything saying that Númenoreans were unbearded. Even his statement on the Elves is contradictory with the image of Elves shown elsewhere, as already demonstrated by Thranduil and Círdan.