Sorry but that's a load of crap for many reasons.
a) JIT supply chains have been a focus for nearly a century now. COVID changed absolutely nothing and prior to COVID we have also had massive cost demand swings in various industries including tech due to supply and demand disruption.
b) There's very little JIT going on here. JIT is something that affects you in months. The fact that we have had computers delivered at reasonable prices many months after part costs shot up, and pre-builds only really started being price affected early this year shows the industry actually has quite a lot of stored inventory.
b) Even if companies wanted to build fabs now to address this, it's just not possible. These things take years to build, and equally as long to plan. You can't just magic them into existence. Who in their right mind would start a 5 year $bn project to supply a bubble when the payback may not be realised (OpenAI cancelled Stargate a month ago, along with it backed out of a purchase agreement that is equivalent of 40% of SK Hynix supply in late 2026/27). You'd be mad to build anything right now to try and capture the bubble.
There's nothing wrong with the free market here. This is very much the free market working. It's just you have an idealised view that supply and demand can correct each other in real time, when the reality is for many markets the supply side is highly inflexible.