I asked ACAltitude on Twitter and they confirmed, 500 minimum is a calendar year privilege and thus retroactive. I had one AC flight that was readjusted automagically at the same time bonus miles showed up. I called AE to readjust UA and LH flights since online missing miles report got rejected because they were already credited to the account. The AE agent mentioned that I will be getting the 500 miles minimum retroactively but it takes *A airlines longer to provide proper credit so to wait. I'll wait until the end of the month and follow up.