This is the scenario that i think might've taken place:
The main body of the laptop, minus the battery were manufactured in Aug 2016, before it was released. That seems reasonable for a company to release a product after it has been mass produced and ready to ship. Maybe the battery was manufactured later in November 2016 and inserted into the body, and THEN it gets shipped out.
It is known that companies will only list 1 year warranty from the date of manufacture unless proof of purchase was provided, or if you bought it in the Apple store. I have not submitted my proof of purchase, so maybe that is why Apple website is showing warranty ending date of Aug 2017, a year from when the main body was manufactured.
Anyone think this is reasonable? I will call Apple support and see what they say. But this is my hypothesis right now.
The laptop itself seems to be working fine.