I can't say much about the topic, but it seems to me like you are playig semantics. As I understand it (or not), a SNP is some variation of a gene. You are correct in what you are saying, but that doesn't discredit the study. There may be other things that invalidate it, but your point seems to be an Authority Fallacy.
>they used the wromg term once, so they are not a geneticist.
There's a lot of reasons that migt explain why the term is wrong, and you don't know for sure if it's plain retardation.