When Steve shows the impedance range of the Bode 100, please note that he was using minimum output level of -30dBm. When you can use the maximum output level of +13dBm, the signal/noise ratio will improve significantly and you can measure even further.
Please note also that we recommend using the User-Range calibration whenever you reach the limits of the device or when you want to compensate e.g. a DC-blocker. User-Range calibration does not require interpolation and therefore is less prone to errors.