The "Wild Child" of Los Angeles was not able to learn language either.
While this outcome is what the natavists would have predicted, it does not, of course, prove the "Language by "Puberty" theory.
A similar, although more recent, episode involved a young girl in Los Angeles.
She was locked in a single room by an oppressive father and submissive mother for her pre puberty years.
Like Victor, Genie (that was the name they gave her) had no language, and yet no evidence of hearing loss or autistic behaviors.
After several years of intense training, attempts to make her a linguistic communicator failed. And the slim progress that had been achieved quickly deteriorated.
There was, of course, no control element for either of these cases.
Hence, one can not say for sure that other factors may not have been major contributors to the failure of language to develop.
Perhaps in the best of homes Victor and Genie would not have acquired language.
NOTES: Genie being taught to eat from a spoon.