Theoretically, yes, but I have no involvement with 14DWY outside of moderating the Itch comment section, and it's better practice to visit the actual creator's Itch page since lately there have been scammers on Itch who've tried to impersonate game developers.
So if you'd like to check out the DLC, please visit cutiesai's Itch page to ensure that you're downloading from the official source.