I notice that Noah was allowed to eat all meats.
Noah was told to take the unclean animals by two's and the clean animals by 7's.
8 people on the ark. Eating just one unclean animal - results in species extinction in that case.
Is it your claim that all the unclean animals went extinct???
Clean animals by 7's gives them a food source.
unclean animals by 2's does not.
2 unclean, 14 clean animals
Is it your claim that God said this to Noah before the flood, during the flood? I think it was after the flood just before they disembarked from the ark.
Genesis 7 is before the flood - telling Noah that animals go into the ark by 2's for unclean animals and by 7's for clean animals.
"2 Of
every clean beast thou shalt take to thee by sevens, the male and his female: and of
beasts that are not clean by two, the male and his female."
..
7 And Noah went in, and his sons, and his wife, and his sons' wives with him, into the ark, because of the waters of the flood.
8 Of clean beasts, and of beasts that are not clean, and of fowls, and of every thing that creepeth upon the earth,
Gen 9:3 Every creeping thing that is alive, to you it is for food; as the green herb I have given to you the whole;
And just as some plants are poison - so some animals in Gensis 7 and in Genesis 9 were stated to be unclean and others clean.
Gen 9
20 And Noah builded an altar unto the Lord; and took of
every clean beast, and of every clean fowl, and offered burnt offerings on the altar.
Eating the unclean animals by two's --> extinction.
Eating the clean animals - by 7's --> a food source.
The Genesis text does not tell us what the difference is between clean and unclean -- it does not identify them. But in Lev 11 they are identified - and we are informed that only the clean were "for food". Moses' readers have access to both Genesis and Leviticus so it is no problem for them to find the meaning of the term.