Because it’s a slot and not just a common half-hole used in castellated edges I suggest you ask your manufacturer. See also Castellated edge; plated half holes in board edge. (As it happens, I wrote it earlier today.) As far as the gerber interpretation goes, I don’t see any difference, but it may be mechanically different for the manufacturer because it’s routed, not drilled. Better be sure they are willing to do it, and know the price beforehand.
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