"ACTNews, PANDEGLANG – Tsunami hit coastal areas around Sunda Strait in Pandeglang, Serang, and South Lampung Regencies. The disaster happened on Saturday (12/22) at 9:27 p.m., Indonesian Bureau of Meteorology Climatology and Geophysics (BMKG) predicted that the massive wave was caused by underwater flank collapse after the eruption of Anak Krakatau Mountain as well as the tidal force caused by the full moon." - https://act.id/en/news/detail/tsunami-hit-pandeglang-serang-...
Yes, it's real. Tides are higher around the full moon due to the earth, sun, and moon being (roughly) aligned. If it was already high tide, adding a tsunami on top of it is going to be more impactful than at low tide.
Is that real? Doesn’t seem like it would matter enough. Especially when there was an eruption, why even mention it.