No this is not a hacked account. I have to add a link for a long time its true but the weight loss experts is my new endeavor which I want to share with the Hacker News community.
I am sorry to say this but your point about flagging the specific link as spam is not clear at all. You provide these "query links by subscriber" URLs but is not clear to me what this has to do with the GPGPU link being spam. YES these three accounts belong to the three executive editors of Java Code Geeks and YES each one of us is using his Hacker account to promote the articles he publishes on our site! what's wrong with that?
As far as the post itself is concerned, yes its a legitimate re-publication because the original author is our partner (JCG) thus has given us full permission to republish every article they write on our blog!