I suspect it really is average power not Normalised. From my own Cat 4 Hell yesterday:
Average power 238 watts
Max power 880 watts
Average heart rate 167 bpm (90% of max)
Max heart rate 182 bpm
Average cadence 97 rpm (he’s a bit of a masher by comparason)
Max cadence 192 rpm
Average speed 37.8 kph (no cobbles – well none on the course)
Total time 1 hrs 15 min
Total energy 1,070 kJ
The biggest difference, apart from the fact that he raced for four times as long is that Spartacus can put out more power at a lower % max HR. He’s a bit younger than me, mind. And 12 kilos heavier 😉