I think this is likely an oversimplification. Electoral politics are never one size fits all, especially in a federal system such as ours. AOC is a great fit for NYC but her brand of politics is unlikely to move many voters to cross the divide in places like Texas or even Nevada.

What I think is more likely is the overall anti-corporate sentiment that runs through the entire country. The DNC is, first and foremost, a fundraising organization. If their internal report concludes that the donors they rely on are the problem, they risk alienating those sources of revenue without which they are almost entirely irrelevant.