I think maybe long-term the effect of Korean companies no longer daring to reuse old machines to produce DDR4 because of US retribution is the bigger cause of that.
Repeating this weird claim won't make it true. DDR4 isn't going to come back into fashion, even during a DRAM shortage. Demand for DDR4 can't increase meaningfully when no current-generation processors can use it, and older-generation processors aren't seeing any increase in production or sales. DDR4 is not a substitute good for the RAM that's in short supply.
Repeating this weird claim won't make it true. DDR4 isn't going to come back into fashion, even during a DRAM shortage. Demand for DDR4 can't increase meaningfully when no current-generation processors can use it, and older-generation processors aren't seeing any increase in production or sales. DDR4 is not a substitute good for the RAM that's in short supply.