Re: Maybe true
Well they are clearly not doing the right thing. It doesn't matter if the cable works with the phone. In 6 or 12 months you will grab that cable when you need one for some other device and potentially cause a fire or damage to something else because of it.
So they have only half done the right thing and half done the wrong thing.
After all I doubt the cable has a giant 'For use with OnePlus 2 only' sign on it. And their next phone might very well NOT work properly with this cable, assuming they stay in business long enough to make another phone.