Well, depends... :)
"Romex" is generically any type of non-metallic sheathed electrical
cable. The name came from the Rome Wire Company which originally
produced the wire. Now the Romex brand is owned by Southwire and is an
actual trademarked brand.
So, assuming the friend were to specify suitable _type_ of Romex for wet
location, it's ok.
IOW, as posed, imo it's indeterminate as being underspecified...
Sounds like you're trying to help the OP weasel his way out of a
Romex is trademarked, and no product with the Romex brand name is
listed for wet locations. Generically speaking when someone refers to
romex they are referring to a NM cable that is the same as Romex, just
a different brand, not an entirely different animal. That would be
like saying Band-Aid means the Johnson & Johnson product, and bandaid
means a plaster cast.
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