Most reported associations with intelligence are from underpowered studies and have not replicated in larger samples. That site did not show up in a recent study of 100,000+ people, and generally hasn't been replicated over the last 6 years as sample sizes have exploded.
ETA: Gwern's comment below suggests a relatively plausible explanation for non-replication.
If you look at the fulltext, this is for a mutation analyzed via the old standard Mendelian techniques, not a brute-force SNP analysis, as your link refers to:
...Fortunately, the process of Mendelian inheritance allows a further robust test of the causality of the Arg844His mutation to be performed, avoiding the usual problems of confounding from other variables that might aggregate in a familial fashion but might be unlinked to the mutation. To test the relevance of the mutation, affected and unaffected first‐degree sibs in each generation (II:2, II:6, II:
The article by Robert Sparrow:
Quote:
The possibility was discussed in MIRI's "Uncertain Future" toy forecasting model back in 2009, and the analysis formulated a few years before that.
ETA: And further discussed in James Miller's recent book, "Singularity Rising."