Hanlon's Razor: Do not attribute to malice that which can best be attributed to incompetence. Especially with DJI software.
DJI (along with countless other companies, I'm looking at YOU Apple) has shown that inter organization communication and coordination is an interesting concept that is only occasionally performed successfully.
It's not hard to imagine that the engineers on the P4 V2 decided to do something not supported in an older API. They may have done it with full knowledge that the software wouldn't work or, more likely, the intern playing around on her coffee break may have found it. They may or may not have told the API maintainers (if they still exist) about it. There may in fact be work tickets to fix it. DJI might wait until enough complaints come out. DJI might be refactoring the entire API (oh, goody - more bugs).
It's complicated.