I guess in a similar way that other people are said to be “destroyed” in this life without their post-mortem existence or ultimate destiny being in view:
“But the Pharisees went out and conspired against him, how to destroy him.” Matt 12:14
“The king was angry, and he sent his troops and destroyed those murderers and burned their city.” Matt 22:7
“They were eating and drinking and marrying and being given in marriage, until the day when Noah entered the ark, and the flood came and destroyed them all.” Luke 17:27
“…but on the day when Lot went out from Sodom, fire and sulfur rained from heaven and destroyed them all…” Luke 17:29
“He will come and destroy those tenants and give the vineyard to others.” When they heard this, they said, “Surely not!” Luke 20:16
“And it shall be that every soul who does not listen to that prophet shall be destroyed from the people.’” Acts 3:23
“For if your brother is grieved by what you eat, you are no longer walking in love. By what you eat, do not destroy the one for whom Christ died.” Romans 14:15
“If anyone destroys God’s temple, God will destroy him. For God’s temple is holy, and you are that temple.” 1Cor 3:17
“And so by your knowledge this weak person is destroyed, the brother for whom Christ died.” 1Cor 8:11
“We must not put Christ to the test, as some of them did and were destroyed by serpents, nor grumble, as some of them did and were destroyed by the Destroyer.” 1Cor 10:9-10
“While people are saying, “There is peace and security,” then sudden destruction will come upon them as labor pains come upon a pregnant woman, and they will not escape.” 1Thess 5:3
“But those who desire to be rich fall into temptation, into a snare, into many senseless and harmful desires that plunge people into ruin and destruction.” 1Tim 6:9
“But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Master who bought them, bringing upon themselves swift destruction.” 2Pet 2:1
Paul likely has in mind the same “destruction” of the Jewish people that he spoke of in 2Thess 1:5-10: 2 Thess 1:5-10