Fair point, thank you!
How do airlines check documents and visas for itineraries with long stopovers? Do they check each leg individually? Will the check-in agent at DPS not even care about my entry into mainland China?
Airline check-in staff will check TIMATIC. You won't have to worry DPS-HKG, and, like the previous poster said, you won't get your HKG-TFU boarding passes in DPS due to the flight being 2 days later. CX at HKG will be familiar with TWOV.