I was going to suggest using PATTERN to avoid using {file} in the target name:
@nodeselect
Copy HERE PATTERN="*" AS="{date|yyMMdd} *" WHENEXISTS=rename
But, having tested it, I am not sure it makes a difference now, and lxp's command seems fine.
I think it used to make a difference, but I can't find a difference now in Opus 12.12. I think we changed the Copy command to expand things like {file} for each item, instead of just once before the command is run, so the two are equivalent now.
(I still have a slight preference for using PATTERN here, since it avoids having to know that Copy is special and won't turn into a single copy command per file like most commands would when {file} is used somewhere in its arguments. But the actual end results are the same, and Copy only gets run once, for the whole set of files at once.)