What does the song "Harder Better Faster Stronger" means?

I read at another post that it means something about how effective the
assembly line is. However, after I listen to it several times, I came
up with something different.

I think it actually means something about tyrannical act. Like how a
ruler oppress his people to make himself stronger.

This next line "hour after hour work is never over" makes my argument
even stronger. This explains how the oppressed people always work with
no time to rest.

So, what do you think? Please give me your opinion.

Thanks!