You are conflating temperature and total energy. The Sun is not a point source, but in comparison to the Sun, this fusion reactor is. Note that most of the core of the sun is not undergoing fusion at any point in time and the energy released from the tiny percentage that is must heat up the rest, the idle rest, in order for fusion to continue. The fusion reactor the Chinese built only has to heat up a limited amount of fuel as it is fed in. All the released energy can be harvested rather than dissipated into the mass of the sun.
If they could make it last longer than tiny fractions of a second, they’d be crowing about it. If they could achieve net energy output, they’d be crowing about it.
That being said, the US should not fall behind whomever the Chinese stole this technology from.
Yes, but do make a nice counterfeit Airstream trailer from the project photos.
No, that would be forbidden in the West by Climate Change alarmists (heat is bad!) but who vote for pro--China Democrats.