SMEE already has an advanced DUV lithography machine. SMIC already knows how to scale foundry operations. China can already domestically produce basically everything needed in a lithography machine

Literally, literally, China's only issues are the gap from DUV to EUV. These include the light source, photo resist, and a few other factors, but it's by no means building from the ground up.

Edit: oh, and Chinese lithography machines are notoriously cheap compared to the competition