No it was never 80 watts, most likely he is talking about the wattage that you see in GPU-z which is only the GPU chip wattage and doesn't account for the rest of the board like the memory controller, fans, and other components.

Honestly I don't think 33MH/s is easy with a 480 8GB, maybe some with a certain ASIC quality were possible but with my RX 470 4GB the most I could get was like 29.5mh/s and it wasn't really efficient. The best efficiency was at like 28.5MH/s and it still used 120 Watts per GPU from the wall not including the motherboard+drive+ram.

80 watts is just not possible with any RX 470/570.