I don’t see a definitive date on this article but assume it’s 10 or more years old. It mentions the Pentium 4 as a “modern” CPU—a CPU produced from 2000-2008 and succeeded by the Core 2.

What has changed since then, and especially beginning with Haswell, is that contemporary CPUs have so much more branch prediction machinery that they can render computed goto techniques irrelevant. It’s a neat technique, for sure, but people looking for performance this decade need to look away from threaded code techniques and towards ILP and SIMD.