Is All That Gundam hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 1 episodes · G - All Ages
Mecha, Sci-Fi
Animated video created just for a 1989 event that featured all the major mobile suit robots from the first 10 years of the Gundam anime franchise. (Source: ANN)
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