The DRAM and NAND markets are similar, but there are important differences. The NAND market has several more major players and is significantly more competitive.
And the Chinese accusations of price fixing need to be understood in the context that they're trying very hard to get their own NAND fabs up and running, almost certainly using at least some stolen tech. Even without Chinese influence, NAND prices have fallen dramatically since that article was written, due to ordinary healthy market forces.
https://www.extremetech.com/computing/261330-china-investiga...