It's not supposed to redeem him exactly. Since it wasn't him that did the Hydra Cap things, he technically has nothing to be redeemed for.
The problem being not everyone will see it that way, even if they know what happened. It wasn't him... but because it looked like him and they thought it was him at the time, some will still hold him accountable. So in their eyes, he still needs to be redeemed for something he didn't actually do.
It's a bit unfair, but that's how life is sometimes.