I’d presume it was a mistake.
I think they understand perfectly, and the capsule splashed down "off the coast" of "state of Mexico".
No different from saying "The capsule splashed down off the coast of British Colombia" or "The capsule splashed down off the coast of Queensland".
They know perfectly well what Baja California is and where it is.
except for the comma in the middle of the name, which was ytdytvhxgydvhh's point:
"The capsule splashed down off the coast of British, Colombia"
right, it's a typo, it doesn't matter, and there was already a reply 4 hours before yours that said as much, so i'm not sure what you were aiming to contribute with the reply that doesn't acknowledge that it is a typo
"all the people complaining" = up to 1 person