It's ahead of the 7800X3D in some benchmarks, and behind in others. What a YouTuber is going to say will then depend on just how many "ahead" benchmarks they run and how many "behind," because most of them just do a linear average of results. What the benchmarks actually show if you dig in is which software applications are memory-bound, and which are compute-bound.
The 7800X3D is going to have a clear advantage in any memory-bound workload, while the i9-1400KS will have the advantage in any compute-bound workload. If I benchmark 10 memory-bound workloads and 5 compute-bound, I will proclaim 7800X3D the winner, and if I reverse that ratio, i9-1400KS will get the soyface thumbnail.
This is why I very much dislike consumer-oriented marketing. Not too long ago, I was in a situation where consumer marketing fags were trying to infect the enterprise side with their bullshit tactics. It was extremely annoying.