Re: trouble is, it still works just fine.
"More memory, SSD, and a new graphics card have had to sate my tech lust instead."
And this rather exposes the big issue with the whole "the PC is dying" thing. Reports like the one here almost always only look at pre-built PCs from the major vendors. But it's easier than ever to upgrade your own these days, and as others have already noted many components simply don't need replacing. There's no point buying a whole new PC when you won't get any benefit from a new CPU, motherboard, sound card, and so on. Even if you don't do it yourself, swapping in a new GPU or some more RAM can be done for peanuts at a local shop.
So we end up in a situation where the PC is dead and reports constantly come out about no-one buying them, yet somehow Nvidia and AMD are both making a killing selling all the GPUs they can make, while SSD and RAM prices have only just started coming back down after supply finally caught up to the massive demand for them. PCs, especially if you include laptops, are still popular, people are just less inclined to throw out a pile of perfectly decent parts in order to buy a whole new one.