The argument is right there in the article.
But Sanders and Ocasio-Cortez never indict capitalism as a system or call for a struggle against it. And they supported and hailed the Biden administration even as it was presiding over the greatest-ever accumulation of wealth on the part of the financial aristocracy.
For all their fulminations against the oligarchy, they carefully avoid advancing any demand that would deprive the billionaires of their ill-gotten riches. They pretend that society can be changed without a drastic redistribution of wealth, which requires the expropriation of the billionaires.
Tldr: critiquing the system only insofar as to not question capitalism.
The living embodiment of chaos testing.