Frieren is never a boring answer! I struggle to hold myself back from just dropping a Frieren comment in every post here lol. Not sure if it really fits the shonen title though?

Reading more, shounen appears to be a demographic not a genre. But this survey says Frieren is about 60/40 men/women, and around 45 year old audience

https://www.resetera.com/threads/2025-japan-media-brands-popularity-survey-age-gender-trends-anime-gaming-manga-ips-entertainment-genres-media-music-acts-etc.1248051/

So perhaps the publisher was just wrong lol, or is this label just useless?