The one thing Chinese is good at is ramp up capacity, and...

The one thing Chinese is good at is ramp up capacity, and quickly which they've done over 21-22. As an example of these types of ramping up, one of my relatives was involved in industrial rubber production, which his company increased production 50 times in 3 years, and in general a handful of similar firms caused supply to surpassed demand by some magnitude. The solution? Export the excess capacity to third world countries via the Belt and Roads initiative. So no they are not running at a loss, as long as the input prices remain suppressed (Russian Ukrainian war created a somewhat asymmetric market for energy).