Given commercial availability of .277 fury I am not surprised they could reverse engineer a surrogate cartridge for testing.
however given the amount of heaven and earth the PLA has been moving to adopt QJY 201 in 7.62x51mm and their own 8.6x70mm I doubt they are adopting anything different anytime soon. Army’s are big organizations and they don’t turn on a Yuan and give change.
Besides both 6.8x51mm and the 5.8x42mm are takes of a common cartridge concept. Using the same ammunition between Carbine/Rifle (QBZ192,QBZ191/M7 Raptor,M7) DMR (QBU191/M7) LMG (QJS161/M250). Adopting 6.8x50mm would require a majority overhaul of the process well breaking the commonality among the sections.