Tachyon's have been theorized since the 60s. And Einstein's theory was grounded in the constant that is the speed of light in a vacuum, using it as a point of reference for relativity. I'm sure if you adjust the constant (given that the speed of light itself actually varies in minute amount), then you will find it very well within the ballpark, but him being off isn't too big of a surprise. Truth is that he is still right about many other things, putting him ahead of the curve.
What this proves more than anything is that we need to look below our usual perspective and strive to work on the quantum foam itself.
Nice tidbit, for being as brief as it is.
