The author of this piece, Arch Robison, has been an active contributor to Julia. Not only did he write this tutorial, but he actually contributed the `@simd` implementation himself.[1]

He also presented this information as a talk at Juliacon back in June.[2]

1. https://github.com/JuliaLang/julia/pull/5355

2. https://www.youtube.com/watch?v=zFxaK0ufL04