Yeah, that's just a clarification. It was always like this in the RAW.
Action: Usually none. Normally, you make a Hide check as part of movement, so it doesn’t take a separate action. However, hiding immediately after a ranged attack (see Sniping, above) is a move action.
It takes no action by itself to hide, but that doesn't make it a free action. Otherwise they would have written "
Action: Free".
The Hide check is usually (means in all cases, which are not explicitly ruled otherwise, aka sniping) made as part of movement (move action, charge, run). Therefore you are required to spend an action, which includes movement, to be able to hide, because you cannot hide in any other way, even though it doesn't cost any action to hide. Of course, you can spend a null move action, just to be able to hide, moving 0' (which is included in up to your base speed) that way.
Hiding after a range attack (sniping) does require to actually spend a move action w/o getting to move ("move-equivalent action"), this is normally not the case as you normally get the free hide, if you spend an action to move, but you cannot do that anymore, once you have attacked.
It's basically the same as with drawing a weapon during a move action (it's a slight difference, tho, since it only works as part of a move action, not with any other action, which allows movement, charging in particular), if you have +1 or better BAB. It's not an action by itself (or rather a free action in this case, which is only allowed, if you spend a move action to move), but that doesn't mean you can do it always, just when using a move action to move. It's also the same as with Tumble, you cannot tumble without spending an action to move, but if you do, tumbling comes for free, as it is no action by itself.
Bye
Thanee