People are angry because of the lack of agency, primarily. Or so the article claims :) It is a US publication, and they always have to be taken with a grain of salt when it comes to anything that isn't the US.
Did you know that only residents with official permission to be in Shanghai are getting food? What do you think is happening to everyone else?
And even those are only nominally getting food. For every account of the Shanghai lockdown that includes regular food delivery, there are 5 accounts showing that their food delivery has been a packet of noodles and some cooking oil, once every two weeks.
Then everyone would be dead, so clearly this is not true.
The point is, contrary to this article, government food deliveries are nowhere close to enough.