My assumption with corporate marketing is always to assume the worst with whatever wording they use. "Launching in H1"? That's June, May at best, no earlier. "Sub-$1000"? $999. So when AMD says >50%, I assume 50.1%, while being happy to be proven wrong. But I never assume more than what they're stating explicitly.
Of course, there are tons of leeway here. Are they being complete assholes and doing a worst-v-best comparison, or are they comparing at the same wattage, the same product tier, or some average/geomean of the whole range, and regardless of either of these, during which workloads?
Hence me starting from an asusmption of 50%. That's what they've promised - the "more than" sign is a vague promise with too many ways out of it to matter.
So ... you understand how academic titles work, right? You go through a doctorate, do whatever research project you're workingon, write a dissertation, have it approved, and you are awarded the title of Dr., which you then have for life (unless you do something really egregious and have your home institution strip you of your degree). You somehow finding that funny is ... well, it just makes you look dumb, whatever the reason. It's pretty hard not to just assume sexism from the get-go - especially given the complete nonsense the rest of that post cosists of - but that's irrelevant really. Dr. Su has been AMD's best CEO for quite some time, and her tenure has been massively successful in many ways, including bringing the GPU branch back from a rapid decline towards irrelevance in the mid-2000s to surpassing Nvidia's efficiency and matching them in absolute performance for the past generation (outside of massively power hungry top SKUs at 2160p).
Also, did you miss the fact that this launch date was already announced quite a while ago? Or the fact that AMD launched RDNA2 two years ago, and have been working on RDNA3 since a while before that launch? Is it really surprising that they're launching a new generation close to Nvidia? For anyone following the PC hardware space even slightly, it really shouldn't be surprising at all. This is how this business operates.
The lack of leaks is somewhat unusual, but then AMD tends to have a lot less leaks than Nvidia - no doubt because of them being an overall smaller operation, and there being more interest in Nvidia leaks to begin with.