A história que você está lendo se passa substancialmente no futuro. Como o escudo do Capitão América é indestrutível, faz sentido que ainda esteja presente.
Na página Marvel Wikia , no escudo do Capitão América;
In several alternate timelines, the shield survives and comes to be possessed by other significant individuals. In late 37th-early 39th century, Nathan Dayspring and Tetherbood lead a squad of the Clan Rebellion to obtain the shield, which Nathan used to inspire liberty and justice in his followers and bore into many battles, until it was ripped from his arm.
On Earth-691, Major Victory acted on rumor and legend to find the shield, which he used as a symbol to rally the warring people of Earth after they were freed from the conquering Badoon in the 31st century.
