If the chargers are really considering moving Alt to G (it seems more RT not G) then the case could be made.
But I agree, probably not true.
I do believe Latham may have been their assumed choice all along because they thought Alt would be gone, chargers or not.
Schefter says that the Giants really really wanted Alt.... they were just smoke screening about wanting a QB to try and get a team to trade up with the Chargers so that they could get Alt.