The verse in Peter appears to about the Noah's Ark myth. It also describes a flat Earth. There are quite a few flat Earth verses in the Bible and no spherical Earth verses. At any rate your claim fails because we know that at no point was the entire Earth under water.
If you notice in 2 Peter 3:5-6, this can not possible be the flood of Noah's.
In the flood of Noah's, there were 8 people saved with animals,
But here in 2 Peter 3:6 Note the word
( Perished ) this means that nothing survived, everything perished.to be no more.
Note that in Genesis 1:2, that the earth was without form and void. This is in parallel to the book of Jeremiah 4:23-25--"I beheld the earth, and , lo, it was without form, and void: and the heavens , and they had no light.
Note that Verse 25 is in parallel to
2 Peter 3:6 that everything perished.
That there was no man to be found. Perished
Verse 25--"I beheld, and, lo, there was no man, and all the birds of the heavens were fled"
Note there was no man, unlike the flood of Noah's there were 8 people survived. But here in Jeremiah there was no man and all the birds of the heavens were fled,
So this to can not be the flood of Noah's, there were birds with Noah, but here in Jeremiah all the birds fled, that is to be found.
So this points back to the first earth that all perished.nothing left over, except the bones that are left from that first earth age.
Such as the dinosaurs bones and many other bones.