yes.

"I'd rather be a weed, waiting for the underground fire" is taken from the name "Weeds" in one of Lu Xun's essays. This name is adopted here, which means that Lu Xun compares himself with weeds and would rather sacrifice everything in order to cleanse the darkness and decay of the old society.

A similar sentence

"Bend down and be a cow and horse for the people" comes from Lu Xun's "Self-mockery": looking down at a thousand fingers, bowing down and being a willing ox. It means: we will never give in to those fierce enemies; For the broad masses of proletariat and working people, we are willing to be cattle and horses, do our best, and die.