It was more like "The governor's taxes are high and he sucks at his job. Let me in charge and I'll lower the taxes for everyone." And people went for the tax cut.They didn't hold back Chinese aggression, they aggressively took their land back from China.
If it was about "taking back their land" there would be further rebellions going forward. What happened instead was that the general who came and cut these girls down sent a note about taxes being high, proceeded to lower them and that was it, no more banditry, no more local kingdoms. This guy (the inspiration behind her "hates good generals" agenda) is also enshrined and prayed to as a diety in Vietnam just like the sisters to this day.
