BSA_en_tn/2pe/02/05.md

he did not spare the ancient world

Here the word "world" refers to the people who lived in it. Alternate translation: "he did not spare the people who lived in the ancient world" (See: rc://en/ta/man/translate/figs-metonymy)

he preserved Noah ... along with seven others

God did not destroy Noah and seven other people when he destroyed the rest of the people who lived in the ancient world.