It is worth noting that it has, at least according to Apple's graphs, slightly more than an RTX 3090 in graphics performance.

So, even if it doesn't quite beat Threadripper in the CPU department - it will absolutely annihilate Threadripper in anything graphics-related.

For this reason, I don't actually have a problem with Apple calling it the fastest. Yes, Threadripper might be marginally faster in real-world work that uses the CPU, but other tasks like video editing, graphics, it won't be anywhere near close.