It's not about cost cutting on the design, it's about the global economic situation completing offsetting those cost savings before they can be passed on to consumers.
I'm a bit baffled here. I mean, I presume you are aware about the rising cost of literally everything, everywhere? What makes you think that Sony, unique of all companies, can buck that trend? Nobody else, just Sony? ¯\_(ツ)_/¯
You don't know how large projects supply chains are secured.
They don't go out and pay prevailing market prices for components.
They cut deals for x units of components, where x is a large number in the millions. The contracts may allow for a range of prices but they don't put themselves at the mercy of market prices say 3 years after launch, any more than airliners just go out and buy fuel at market prices when they hedge fuel prices way in advance.
They would have signed these contracts years ago, before this generation launched.
Also better yields and die shrinks should yield cost reductions as well.