I can't say I've read all of that agreement either. Chinese airlines all pay the local Chinese income tax for you and provide proof of payment. This way you don't pay a top up tax back home. I'm not aware of any other country where this occurs. UAE, Qatar, etc definitely do not (not that you'd be likely to rotate from there anyway).
I'm sure the contract rates I can figure out. I personally wouldn't do it for 30% less than the pre-pandemic number despite the tax advantage.
Any info on what a typical month looks like? This is the harder thing to figure out.