It is a fact that instead of what Sanders cult claims, Sanders' campaign actively courted super delegates ahead of the convention in the attempt to subvert the popular vote from the Democratic Party's 2016 primary. I am not going to spoon feed that easily available information to you -- look it up.
As a consequence of false claims that super delegates affected the 2016 Democratic Party primary, party leaders, including Bernie came together to make rules changes.
In 2020, super delegates do not vote in the first round. In order to ensure he wins without further challenges, Bernie has to win a majority of the popular vote in enough states to gain more than 1991 bound delegates. Bernie had five years to make his case and all he did was tear at the Democratic Party. Instead of building bridges, he tore at other people's attempts to reach out. He could have chosen to court votes from people who didn't vote for him in 2016. Instead he insulted their intelligence by telling them how badly they chose when they voted for Obama in 2008 and 2012. He's reaping what he sowed by doing worse this time around.
Your answer? Damn the Democratic Party, damn the need to win hearts and minds of Democratic Party voters. Re-make the rules mid-way though the primary and give the nomination to the one I want. Gimmee freeee stuff.
How very Trumpian of you and other Sanders cultists.