If men were already eating animals as food, why does God “give” animals as food to Noah’s family after the flood (Gen 9:2-3)?

Genesis 9:2-3
2 And the fear of you and the dread of you shall be upon every beast of the earth, and upon every fowl of the air, upon all that moveth upon the earth, and upon all the fishes of the sea; into your hand are they delivered.

3 Every moving thing that liveth shall be meat for you; even as the green herb have I given you all things.
KJV

Genesis 6:5; 13
5 And GOD saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.

13 And God said unto Noah, The end of all flesh is come before me; for the earth is filled with violence through them; and, behold, I will destroy them with the earth.
KJV

I believe that God was restating the rules of morality to Noah, which may have been lost during the corruption:

You can eat of all the beasts, fish & foul of the earth, but you can not eat the flesh of man!

OT:1320
basar (baw-sawr'); from OT:1319; flesh (from its freshness); by extension, body, person; also (by euphem.) the pudenda of a man:

KJV - body, [fat, lean] flesh [-ed], kin, [man-] kind, nakedness, self, skin.

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