Assuming this is accurate: Holy crap!
I have been assuming all along that the per-core performance of the Mac-targeted AS would be very similar to the A14--basically, that we'd be getting an A14X.
I have, therefore, been assuming single-core performance on the order of 1550, and multi-core (for a 4-core, taking into account overhead) around 6000. That alone would have put an A14X with a higher single-core performance than anything Intel makes--right up through top-of-line desktop CPUs--and within striking distance of AMDs very impressive latest, with multi-core performance not far off of the top-of-line, 8-core i9 MBP.
This isn't a stratospheric boost over that, but instead we appear to have single-core performance a few percent higher than even those impressive Ryzen desktop CPUs, and multi-core in the running with Intel's absolute top-of-line 8-core mobile i9-10980HK. In something like one quarter the TDP. Targeted at premium low-end laptops.
That's not exactly surprising, given A-series performance, but it's kind of nuts--you can now buy a MacBook air with better CPU performance than a maxed-out 16" MacBook Pro, because the MBP is stuck on high-end Intel silicon. The MBP has more RAM and better GPU, of course, but its CPU performance is hamstrung by Intel's best.
It seems a little surprising that Apple has outpaced Intel that extremely until you look at the numbers. AMD has also seriously outpaced Intel on desktop recently, and they're a much smaller company. If you look at it, AMD has shipped something like 40 million Zen-based CPUs over the past three years, and while they don't break out CPU vs GPU revenue, their entire business until a few months ago was grossing around $6 billion a year.
We can't say how much Apple has "spent" on its own CPUs, but we can say that between just iPhones and iPads they've shipped around 250 million of their own CPUs per year for a while now. In most quarters Apple makes more net profit from just the Mac than AMD's gross income from CPUs and GPUs combined. For the matter, when AMD started really beefing up its offerings and outpacing Intel, Apple could have bought the company outright with couch change.
Basically, Apple was, even before the M1, shipping vastly more CPUs than AMD was, and has all the money in the world to spend on development if they want, so if AMD can compete successfully with AMD it should come as absolutely no surprise that Apple could do the same and then some.