I read around that DeepSeek's team managed to work-around hardware limitations, and that in theory goes against the "gatekeeping" or "frontrunning" investment expectations from nvidia. If a partial chunk of investment is a bet on those expectations, that would explain a part of the stock turbulence. I think their 25x inference price reduction vs openai is what really affected everything, besides the (uncertain) training cost reduction.
We all use PCs and heck even phones that have thousands of times the system memory of the first PCs.
Making something work really efficiently on older hardware doesn't necessarily imply less demand. If those lessons can be taken and applied to newer generations of hardware, it would seem to make the newer hardware all the more valuable.