That seems a tad optimistic to me, given all of the dyno results I've seen here and elsewhere where the cars were typically in the 360-370 whp range. For 412 crank hp, that's right where the power output should be to the wheels.
Maybe they had a ringer, maybe it was a factory freak, a generous dyno, inaccurate conversion math, who knows, but that sounds atypical to me.
Typically when dyno testing, you try to use the gear that is a 1:1 ratio or as close to that as you can get.
You don't care when my car was built or what options it has.