If the car is strapped to a rolling road dyno then torque is measured at the wheels and the wheel power is calculated from those readings. The crank figure is then worked out using coast down losses or a straight percentage transmission loss. Crank torque is only measured if the engine taken out and strapped to an engine dyno.Correct in EU we measure at the crank, which means tuner cars are put on a (often inaccurate) dyno to measure at the wheels, then minus a percentage of approx 15% (but this may vary to make the numbers look better) to account for drive train losses. The resulting figure is then usually rounded up to something a bit more impressive and presented as fact.
The reason dyno figures vary so much is because dyno operators add in correction factors to inflate the power figures to show how much extra power the customer got after buying products.
It's a big argument all over the car and bike world and we won't solve it here. UK measures at the wheels fyi