I know I've read that somewhere, too, and I'm fairly certain it was an official source. There's, uh. Well, once again, hesitant to apply laws of biology to a fantasy setting, but there appear to be enough consistencies that assuming at least a common shared ancestor between Hyur and Elezen isn't out of the question, but science isn't advanced in Eorzea to the point where that could be determined by anybody living there.
There's also the Crazy As Balls Hypothesis for why the Hyur and Elezen are similar enough that the Hyur have made note of it while the Elezen vehemently deny it. Have you seen the concept art for Shiva? And have you noticed how a certain region that is mostly inhabited by Elezen has suddenly and mysteriously become covered in ice and snow after years of being a more temperate region- a region inhabited by individuals who display fanatical devotion to an icy goddess? You know how the beastmen races have grown to resemble their Primal over time?
Cough. Cough.
There's also the Crazy As Balls Hypothesis for why the Hyur and Elezen are similar enough that the Hyur have made note of it while the Elezen vehemently deny it. Have you seen the concept art for Shiva? And have you noticed how a certain region that is mostly inhabited by Elezen has suddenly and mysteriously become covered in ice and snow after years of being a more temperate region- a region inhabited by individuals who display fanatical devotion to an icy goddess? You know how the beastmen races have grown to resemble their Primal over time?
Cough. Cough.