Is Gundam Build Metaverse hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2023 · 3 episodes · PG-13 - Teens 13 or older
Mecha, Sci-Fi
A boy named Rio is enjoying Gunpla Battle in the new Internet service known as the Gundam Metaverse Project. After installing a login set in his room at home, he dives into the Metaverse, together with the Lah Gundam he created with this day in mind. (Source: Gundaminfo)
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