Coming back to the question ...
That Goenka material differs in my mind from that taught by the Nigganthas, in a very crucial point:
The Nigganthas believed that kamma (or sankhara, or whatever term one may use) are burnt off / eliminated by the experiencing of ascetic pains (tapas)
Buddhism also talks about eliminating these, but certainly NOT by physical asceticism (as self-mortification). Or even "burning off", but again, the metaphor of tapas as asceticism, already a pun on tapas as the sacrificial fire, is rendered in Buddhism to the fires of wisdom, a strictly mental engagement
You may like to check out Bronhorst's , and / or . He makes the differences very clear.