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That kit is part of the Deluxe edition, or $2.99 if you want to buy just it without the other bonus items. I think calling it DLC is a stumble by CAPCOM, but this guy has made a whole lot of drama out of his entitlement over not getting items from another SKU with his FREE pre-release copy of the game he finished in advance of release.
EDIT - Words are hard (spelling).
Apologetics aside, “this guy” is a random steam review.