Yeah mistranslated by that hoaxer Zecharia Stitchin
Zecharia Sitchin (July 11, 1920 – October 9, 2010) was an Azerbaijani-born American author of books proposing an explanation for human origins involving ancient astronauts. Sitchin attributes the creation of the ancient Sumerian culture to the Anunnaki, which he states was a race of extra-terrestrials from a planet beyond Neptune called Nibiru. He believed this hypothetical planet of Nibiru to be in an elongated, elliptical orbit in the Earth's own Solar System, asserting that Sumerian mythology reflects this view. Sitchin's books have sold millions of copies worldwide and have been translated into more than 25 languages.
Sitchin's ideas were rejected by scientists and academics, who dismiss his work as pseudoscience and pseudohistory. Sitchin's work has been criticized for flawed methodology and mistranslations of ancient texts as well as for incorrect astronomical and scientific claims.
No I SAID they were mentioned in sumerian myth, get it right
The Anunnaki (also transcribed as: Anunna, Anunnaku, Ananaki and other variations) are a group of Mesopotamian (Sumerian, Akkadian, Assyrian and Babylonian) deities. The name is variously written "da-nuna", "da-nuna-ke4-ne", or "da-nun-na", meaning something to the effect of "those of royal blood" or 'princely offspring'. Their relation to the group of gods known as the Igigi is unclear — at times the names are used synonymously but in the Atra-Hasis flood myth they have to work for the Anunnaki, rebelling after 40 days and replaced by the creation of humans.
In 1983, with the publication of Robert J. Sharer's revised table of date correlations in the 4th edition of Morley's The Ancient Maya,[Note d] each became convinced that 21 December 2012, had significant meaning.
But to answer your question. They probably figured its a bunch of baloney that translates good into selling books yet not quite into spending millions of dollars making a movie.