Indeed. Leiji Matsumoto was a known pro-Japanese nationalist, painting the Gamilons and their planet bomb "nukes" as a thinly-veiled allegory for Americans and their bombing of Hiroshima and Nagasaki. The frequent nuclear holocaust imagery early in the first series was no coincidence.
I find it amusing how the rebooted 2199 completely remade the Gamilons into more of a Space Nazi thing, even going so far as renaming the single-named Desslock (or Dessler) as "
Abelt Dessler", with his mother named "Adelsia Dessler", uncle "Erich Vam Dessler", elder brother "Mathius" and nephew "Lanhardt". In fact, ALL the
Gamilon characters in 2199 have very Germanic/Tutonic-sounding names.