I can't say I'm surprised. It was clear that they're only interested in the appearance of unity, but they actually want the progressive gone because they upset their apple cart.
The media has been putting out articles about how Democrats need to strengthen their ties to Wall Street, and how Democrats should focus on identity politics instead of income inequality. Meanwhile, Democrats are already looking at ways to ensure yet another tool of the establishment becomes their nominee, such as moving up the California primary.
As much as they love using Bernie Sanders, you have to be blind to not to see their true intentions. As corrupt and disastrous as Trump is, I believe the chances of a neoliberal beating him is far less than a progressive. We already saw in 2016 that supporting NAFTA, TPP, and not bothering to campaign in the swing states is toxic to winning over working class voters.
Yes, some of them vote against their own self interests. However, a progressive who fights for income equality is likely to do better than a neoliberal who doesn't. The DNC appointed an anti-$15 minimum wage stooge to the Finance Committee, and we all know where they stood on the TPP. They don't care about people's jobs or ability to make a livable wage.
As long as the DNC has that corporate cash rolling in, they'd rather take their chances and lose to a Republican than win with a progressive.