First of all, He’s Mayan actually
And secondly, just because Namor and the people of Atlantis (Talokan in the MCU's case) are depicted as Yucatec-Mayan, doesn’t mean that some other enemies from Namor could be of Latino heritage.
As a Mexican person myself, I believe that a Danish actor, who is known for playing many psychopathic antagonists in the past, could be a fitting casting. Also instead of colonization, Commander Kraken could represent piracy.