I have a 5820K with a 3080 and I play games at medium/high settings at 1440p to get the best FPS.You're suggesting it's a realistic situation that someone with a 1600x is going to buy an RTX 3090 (at all) and then play games at medium/low settings at 1080p?
Isn't it common knowledge that pairing low end CPU's with high-end GPU's is going to cause a massive bottleneck anyway?
The "problem" was also much less pronounced on Intel, so are we sure the problem is being caused by Nvidia?
It's also maybe only one or two games, how many games did they test and how many games had this problem... A quick search suggests these guys are pretty well known for clickbait
A CPU upgrade would cost the best part of £500.
It's a problem.
Your searching skills leave a lot to be desired if you think these guys do clickbait.