GCN is guesstimating Tadej to have done 416 to 425W (6.4 to 6.5Wkg) for 32 minutes, in an aero position.
Interesting points they are making is that his „white jersey“ suite is less aero than the real top of the range skin suits.
Also, the Campa wheels should be quite a bit slower than the AeroCoach wheels or the Tri Spoke Küng was riding.
Tadej is certainly a great timetrialist. Everything else is speculation 