This is perhaps a case of purposely confusing marketing. All vehicles have the hardware for full self-driving capability but not yet the software. The full self-driving is to be enabled later on through an over-the-air software update.
It's not merely purposely confusing. It's at best, not an outright lie only because they hope it's true.
People's eyes can detect individual photons, at much higher resolution and dynamic range than a typical camera.
The question of purposefulness is mostly irrelevant. It is their responsibility to avoid ambiguity in this domain because this could be dangerous. They are not doing it => they are putting people in danger. Now a posteriori if somebody manages to sue Tesla after a death a bad injury, maybe the purposefulness will be studied (but it will be hard to decide), but a priori it does not matter much as for the consequences of their in any case mislead attempts (even if it was only for an advertising harmless reason in the mind of the people who wrote it like that in the first place).
To finish, that they are carefully choosing their words to be technically true over and over, yet understood in an other way by most of the people, is at least distasteful. That they are doing it over and over through all existing channel makes it more and more probable that this is even on purpose, of course there is no proof but when we reach a certain point, we can be sufficiently convinced without a formal proof (hell even math proofs are rarely checked formally...)