Measurments done on ATmega16L (X32K_2v7 oscillator module listed in chapter 6 in the app note) is performed with the CKOPT fuse enabled. This fuse enables internal capacitive load and is not recommended for 32 kHz oscillators. 

The ATmega16L/X32K_2v7 oscillator will be requalified with the CKOPT fuse disabled. 