How do you unlock "Classic" difficulty mode?

In The Evil Within 2, the hardest difficulty mode is "Classic" and is not available from the very start.

How do you unlock this difficulty mode?

Note that I would assume it is unlocked by completing the game, but in the original game you unlocked "Akumu" (the hardest difficulty) by completing the game on "Survival" or above ("Casual" did not unlock it).

So I am particularly interested to know if "Classic" can be unlocked by completing "Casual", or if "Survival" is required? That is of course assuming it's completing the game that actually unlocks this mode, and not something different.

In order to unlock Classic mode, just beat the game on any difficulty. Source:

To unlock Classic Difficulty, you have to beat the game once on any difficulty.