All of this. If his prompt to write his name was spoken to him in any language besides English, that is something that would have been very publicly and clearly released by now - the language he understands is not protected private medical information, they would have had no reason to withhold details about whether he responded to Creole or Spanish or any other spoken language, and if it had been something other than English that would have been pertinent to identifying him.
If anyone would like to assist me, my goal this week is to try to contact admins from social media groups related to keywords "autism", "autistic", "nonverbal", "nonspeaking", "special needs", "Angelman", and "Phelan McDermid" (these last two are syndromic genetic conditions that frequently result in an absence of speech and in being diagnosed with autism which also have phenotypical facial features that I think could be consistent with Cordarius' features).
My hope is that if we can get enough social media groups across the country - but especially in Texas, New Mexico, and Oklahoma - to share his face and his story, there is a chance that someone could recognize him just from old posts his caregiver could have made about him, at some point.