That's not a fully warranted conclusion. Russia just discovered that its conventional forces are quite ineffective, and its military industrial complex is not able to produce enough materiel to adequately supply a large offensive.
China is quite the opposite. Of course, until the actual fighting happen, we can never be sure, but it appears China has lots of soldiers, they are well trained, it has a huge conventional military capability, and a huge economy that can be redirected to war production, and can produce an overwhelming number of missiles, artillery shells, drones, landing craft, you name it.
It is not in China's interest to use tactical nuclear weapons. Its official nuclear doctrine is of no first use. Of course, they can decide to use that doctrine as crumpled paper, but they don't have any reasons to do that. From their point of view, the best use of nuclear weapons is for deterrence. They can draw red lines in the sand. As long as their conventional forces can achieve whatever goals they have, using tactical nukes would just be dumb.