Yeah I just dropped a comment about this on another thread. There's 8 links on the front page about AWS submitted by the same two people. 19 AWS posts submitted in the past 24 hours. It looks like a concerted shilling effort.
Additionally, while this is tied to re:Invent, other situations like this are where I see post A, that leads me to article B, I post it. Now there are two related posts. A dozen people do the same thing, readers of the front page are already primed to be interested in that topic, so we get a bunch of correlated content just by the way HN and social link sharing systems work.
Nope, just a conference.
(I WORK FOR AMAZON)
Caught them, Amazon trying to take over HN. All Hands, Abandon Ship.