The correct interpretation of that passage is about God’s sovereignty. Paul is being hypothetical about God predestining people to destruction while predestining the salvation of others.
Paul doesn’t say that
is what God does, but rather is just making a point about God’s sovereign choice to do anything He wants. Hence the "what ifs."
Look at it again. The whole context is Paul answering hypothetical questions.
Romans 9
22What if God, although choosing to show his wrath and make his power known, bore with great patience the objects of his wrath—prepared for destruction?
23What if he did this to make the riches of his glory known to the objects of his mercy, whom he prepared in advance for glory—
24even us, whom he also called, not only from the Jews but also from the Gentiles?