Yeah um, no...
The 3600 might beat the 9900 STOCK 3.6ghz, but the 9900k can be OC’d to 5ghz+ (something the 3600 just can’t do).
If you are an overclocker then the 9900 is still the way to go.
The 9900K doesn't run at 3.6GHz stock, at least as long as it isn't overheating. The 9900K's stock clocks have it boosting to 5GHz on single-threaded workloads, and even with all cores fully loaded it can boost to 4.7GHz. So, a 5GHz overclock should only have a small effect on its performance.
However, this article is old news at this point, and these processors are now available and have been reviewed, so there's no need to rely on pre-release rumors and results from a single benchmark. The new Ryzen processors can perform more instructions per clock than Intel's, and that largely makes up for their lower clock rates. But while the 3600 can in some cases outperform a 9900K, in most applications the 9900K will be a bit faster, and that processor's two extra cores will of course give it an advantage in most heavily-multithreaded applications. The 8-core, 16-thread 3700X is a closer performer to it in terms of performance while still costing substantially less, and the 3900X offers 50% more cores for more multithreaded performance, along with a reasonably capable stock cooler at a similar price. The 3600 is more an i7 competitor in terms of performance, while being priced like an i5.