I wouldn't call it a figure of speech. It is simpy a rhetorical pattern of consistency. I would also have put quotes around "heros" in the second instance.
If he had written ... "I would rather call those Chinese who dare burn themselves to protest against the regime's misrule and tyranny heros" then you can see how the "heros" is lost entirely, after tyranny. Sounds like a "tyranny hero" if there could be such a thing.