And the real meaning of this for actual people:

1) DRM on these machines is dead (yay).

2) "Anti-theft" features, which are really there just as an excuse to put a dedicated DRM chip into your box, are dead.

3) Physical access to your machine by a sophisticated attacker is game over (unless your data is encrypted and at rest).

I hope #3 isn't news to you, despite having an Apple logo on your machine (or Phone).