Really? You're going to ignore the nuance of it all and just use Exact Words? I know you think Bernie is ineffective and/or trying to make a power grab on the backs of the common people, but you seem much too intelligent to make a mistake like that.
Superdelegates are a statistically significant portion of the electorate - according to Wikipedia, about one-sixth of the total number of candidates. Of course they're going to matter. The point of Bernie's 'superdelegates don't count' argument is to show that they are free to choose who they vote for, IE, the bound delegates - the non-supers - are the ones that must be captured first.
Bernie's strategy has always been populist in nature. He knows that the superdelegates represent the political establishment - governors, members of the House and Senate, as well as the various peoples within the DNC (and I think I know who they'd vote for). Bernie knows that his path to victory is to get enough of the working class, the common people, the people who've been snubbed and treated badly by the establishment, on his side that the establishment realizes if they don't back Bernie, then they'll have some very angry people on their hands.
To add on top, a few people are worrying that if Bernie doesn't get the nomination, then a significant portion of his viewers might hop the fence and vote for Trump. The Guardian, Salon, CNBC, Huffington Post...all of these places have articles saying that these people, these Democrats, will not vote for Hillary. They'd rather turn coat and join 'the enemy' than continue to play for their own team.
Why? Because Bernie and Trump have one very major thing in common - they're fighting this political war with a very simple message. The country is broken, there are people out there who broke it, the people who broke it need to be brought to heel, and the common person needs to be restored within the United States.
Now, who the people are depend on who you're talking to. Trump says the political correctness/SJW crowd and the media; Bernie says the wealthy and big corporations - but both of them blame the political establishment for letting things get this bad. Which is why the DNC has been trying to bury Bernie and the RNC is trying to figure out how to put a guy who hates government ahead of Trump.
In addition, the cry of 'supers don't matter' is meant as a way to keep up turnout and encourage people to go out and vote their minds, rather than what the polls are saying. To give an example.
I decide to run for the seat of Governor of Washingtonia. My opponent, in the primary election, is Ex-Representative Buttface. In Washingtonia, 30% of all 1500 delegates for the primary are supers - for a total of 450 - and 800 are needed to win. The primaries take place over the course of...let's say a month, with a primary every other day. The first-up primaries are in the big cities, and Buttface wins big there in the first week, garnering 500 of the 800 he needs to win, while I only get 200. Only 800 delegates left, and I have twice as much ground to cover as Buttface. What's the normal response from the average person?
"It's over, Reiji has lost, might as well go vote for Buttface."
Except, what goes unsaid, is that 200 of Buttface's 500 are superdelegates. IE, they can flip over to my side, and now I have 400 compared to only 300 for Buttface. Now who's closer?
If the people hear that, then they'd say to themselves, "Hey, Reiji's still in this thing, it's not a done deal, I'm going to go vote for Reiji!"
That's what this whole thing is about - keeping people from getting discouraged and not showing up because they think it's over.
In short, if we're going to go by nothing more than the words on the page, yes, now all of a sudden the supers do matter after weeks of saying they don't. Congratulations. You win.
But Bernie's strategy hasn't changed one iota.