What I wanted to mean is that it comes from a text older than the Akallabeth, not retaken later. And such remarkable "technology" must appear or have notice of that even in the Third Age, and that not happens, it is not "developed" so it seems very rare to have this paragraph here and then, what...? (IMHO).
As for Alkar I still think that is valid because we are agreed that this legends are mannish and it cuold be a name taken by the Numenoreans (or some of them) as an alternative name for the Ainu in his orinal form, but nevertheless it is not so important for the story itself.
Greetings
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