As an owner of 2x 2080 Ti and quite a few other multi GPU setups (work and play), I was at least pleased about this: "Existing SLI driver profiles will continue to be tested and maintained for SLI-ready RTX 20 Series and earlier GPUs" in the article.
Also, I wouldn't necessarily jump to conclusions that all mGPU is dead/declining fast, just traditional SLI such as AFR (there are several different methods to do SLI). On the contrary, I expect mGPUs, tiles and so forth -.and with it CFR - to gain in importance, with traditional SLI (AFR etc) declining further ...per article "For GeForce RTX 3090 and future SLI-capable GPUs, SLI will only be supported when implemented natively within the game.". Even then though, knowing a bit about the underlying game engine will help re. NV Inspector profiles that may be substituted. The 3090 / Ampere gen is likely a transitional GPU gen, given what has leaked out about mGPU and Hopper, Intel Xe and even post-RDNA2. Traditional SLI (AFR etc) does have several problems such as micro-stutter and asynchronous loads that for example mGPU CFR does not which is why the focus will shift away from traditional SLI and towards CFR,, BTW, I already run on quite a few apps on my 2x 2080 Tis system in CFR - doesn't work everywhere, though it does on my fav apps, fortunately
All that said, this news does impact the purchase decision re. 'one' vs 'two' 3090s (or even Ampere Titan) when the time comes