China has more people, more money to spend on research, more equipment, more manufacturing base, more STEM graduates, more everything, and all of that by huge margins.
I'm not sure about the other claims but the most logical reasoning is that China has better supply chains and way more STEM graduates.
China wants to gain a technological edge on all other countries. If they happen to be the first to turn a room temperature superconductor into usable commercial or military materials, then they'll have a huge military or economic advantage for some period of time.
God, this kind of thinking is so brainwashed. The relentless China demonization propaganda has made it so that people in the West don't actually believe that Chinese people have normal human behaviors. In a way, the western media has succeeded in portraying all of China as evil and themselves as good.