You're saying "a lot of evidence" like it's some esoteric choice. It's in their most recent 5 year plan:
New Energy Technologies: Xi Jinping has announced that new energy technologies such as car batteries from state-owned enterprises will make it so that half of the vehicles in China be electric or fuel-cell powered, and half hybrid by 2035.
That's their goal, and they have a poorer population on average than western states, so it'd seem like "dumping" when it's just them not marking up their cars for the west.
Seems like this is more of a case of the owner not going through legal means before investing in these cars and or using their space as storage, because it's not like these just appeared on the owner land without their approval.