Source for the visual is the official website. According to Crunchyroll, the voice actress for Elfuda (sometimes translated as Erufuda), Ayasa Ito, will also serve as a guest judge at the Japan French Fries Championship 2024.
Series premieres July 6, 2024. Synopsis from AniList:
Naoe-kun, a massage therapist, is about to head home for the day when he’s saddled with a rather strange patient. This lovely lady has emerald eyes, pointy ears, and grew up in the forest–everything about her screams “elf,” except for one thing: her bodacious body. It turns out she left her world but loves junk food in this one, and now her obsession has caught up with her. Can Naoe-kun help this lovable elf girl lose the weight–and keep it off?
It’s a little funny, but I don’t see it as a misstep. It’s probably just a popular (I assume) character who’s associated with fries, and them being realistic in assuming that it’s common knowledge that over-indulging in fast food causes weight gain.