I wouldn't rule it out as a possibility but at the same time...Hydaelyn existed before the Allagans rose to prominence. Not every race will have been genetically engineered - but we already know that at least one of the Beast Tribes can be linked to genetic experimentation. The Ixal are descended from the Ixalion after all. I also cannot help but note that the Amaalaja look pretty similar to the reptile creatures seen in Azyz Lla.