Is .hack//G.U. Trilogy: Parody Mode hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2008 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Fantasy, Parody, Sci-Fi, Video Game
A special bonus Parody Mode added to the extras of the .hack//G.U. Trilogy (Source: AniDB)
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