There IS a ft/lb scale on the right of the chart. Both Y axes are labelled at the top. Granted the scales are the same numerically but that just might be a coincidence. But we are short of information about what actually is being measured, but could just be that its actually correct! see here C63 Torque/HP Curves - MBWorld.org ForumsYou can't tell what the torque is because there is no ft/lb scale on the right of the chart. The numbers on the right are the same as the BHP figures on the left. If you really want to know all your numbers you need to to get it on a decent dyno. But dynos give different numbers depending on many factors.
Those curves show a lower power output but a matching torque output so maybe one is being measured at the flywheel and the other at the drive wheel.