Actually, given the tone, double standards and content of the article, yeah, I'd call it very much a hit piece; the video I linked gets into it with more detail into explicitly how it qualifies as one. I can find more examples once I'm no longer at work.
Second, what hypocrisies? Why is failing to register as a Democrat a hypocrisy? How is picking the lesser poison, while acting to reform it, to avoid the greater one a hypocrisy? It's pretty obvious that in a two party system where power for the foreseeable future will only ever really be delegated between said parties, you've got to pick a side if you want a seat at the table and enact policy, even if you have violent disagreements with yours which he very much does.
Third, Bernie has always had reservations and misgivings about the Dem party, and these persist to this day. He does not consider himself a democrat, and explicitly refuses the label when asked, while also vocalizing criticisms against it. Bernie sees the Democratic party as a problematic institution to be reformed, but also the only viable vehicle for progressive policy; it's not that hard to figure out where he's coming from.
Also, you've failed to identify the Dem talking points Bernie is hashing out; again the unity bit is perhaps the one and only thing that really fits this criterion (which I'm sure he views as a necessary evil to defeat the greater one of the GOP).
