Are you saying the Earth is only 6000 years old, but the flood was 30,000 years ago?
No. Earth about 6000 years old flood about 4500 years ago.
There are many things which are supposedly millions of years old but not C-14 dead.
That proves that they are not millions of years old,
Not many things are C-14 dated about 30,000 years old.
They should not be dated as 4500 years old for the flood to be true but about 30,000 years.
The amount of carbon dioxide in the atmosphere was at least 20 times 1960 levels.
Also the amount of C-14 would have been less.
So the c-14 to c -12 would have been about 1/30th of 1960 level.
That is about 2^5 times less which is 5 half lives.
The half-life of C-14 is 5730 years
5x that is 28,650 years of extra age,
4500 + 28,650 = 33,150 years
The average of the dates in this link is about 30,000 years.
Bingo.
They are from the flood.