I have to admit my car doesn't hang about and I can easily induce wheel spin in the first 4 gears, a high RPM gear change above 100mph will spin the wheels, so the engine is certainly producing a good amount of torque still.
The details I look for on Dyno runs are the things most people know little about, and that is Barometric Pressure, Ambient Air Temp, Intake Air Temp, Ramp Ratios, Inertia Ratios etc.
Any one of these can be tweaked to give higher or lower readings.
Also on the video you posted the 429 figure is their own calculated engine power and not power at the rear wheels. They have a Barometric reading of 1006 which means it's well above sea level, if we knew the location we could find out if this figure is way out or somewhere safe. I also noted there was no temperature reading at all with the result displaying 0.0 degrees, this alone is enough to make the results only fit for the bin.
I like to see results that are displaying all the required data to allow for a like-for-like run.
Air temp is a very common failing for most Dyno runs as if that's wrong then you may as well forget it.
I have seen Dyno runs with temp readings swinging by 60 degrees, this affects the multiplier equations used by the Dyno software when working out final power readings.
Another thing I learned about is different Dyno makes use different variables which effectively give out different readings, so you need to use the same type of dyno to be able to compare, unless you know the exact ratios to adjust figures.
These affect the in-built correction Factors.
364.99 wheel power would be about where this V12 is performing, that is if the temp and other input data is reliable which I have my doubts over.
Plus coming from a Tuning shop I would imagine they tweak the figures in their favour slightly as has been found at some others in the past. I know of two tuners who have a switch wired into the Dyno so they can instantly alter the air temp and falsely increase figures.
I imagine for the whole V12 engine range including the Vantage and GT models you might see a range of engine powers between 405hp to 450hp, then you have the tolerances in the drive train, losses of between 10% - 20%.
I was expecting somewhere between 380 - 400 form my GT, to hit my upper expectations was fantastic and might be due to having a good engine mated with a good transmission.. some unfortunate Aston owners might get a lesser engine mated to a lesser transmission and suffer a 20% drop in power, however for most owners this would not be noticed.
There is certainly room for debate on the whole Dyno subject ;-)