If you read the words "the gene for
This reveals a basically magical, not scientific, idea of what "genes" are. Or a scammer.
Even in medical contexts, there is a vast gap between identifying a genetic variation associated with a disease and figuring out what the gene actually does and how the disease actually arises. It's the *beginning* of the real research.
A lot of this crap works along the lines of "Ooh, people with abnormalities in this gene can't speak" from which is deduced "Eureka! we've found the gene for language!"