I don't see any reference to Arena codes on the Amazon store listing, and there aren't any announcements about it on Arena, so I assume the Wiki just copied over an old product reference and didn't check if it was accurate
This seems like the most likely case. I could have sworn that I saw mentions to Arena elsewhere a few days ago, but now I can't find anything else than this wiki page.
And as far as I understand all previous starter kits did have such codes (this is my first one, so I can't speak from experience ๐ ), so a copy-paste error makes sense.
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