The Chinese don't have access to new EUV machines.
All of their fabrication ability is based on old processes.
Not so sure about that: https://www.reuters.com/world/china/how-china-built-its-manh...
DDR5 is DUV not EUV
Not so sure about that: https://www.reuters.com/world/china/how-china-built-its-manh...