First, Scott mentions they met “a few years ago,” referencing the events of Captain America: Civil War. While this would seem to track with the amount of time that’s passed between that movie and Endgame, there’s something more. A close examination of the screen shows the word “archive” in the top corner, suggesting that Cap’s not so out of touch as to suggest that this might be old footage. There’s also the fact that the numbers next to it, though obscured, seem to read "1983." Thus, this theory posits that Ant-Man has somehow traveled back in time, providing a vital key to undoing the damage done by Thanos.
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