If your frame is Aluminium, the big bolts (T40+) through the frame and into the mounting plates then the torque is 20Nm
If Carbon, the same bolts are 11Nm
The bolts that hold the plates to the motor are 6Nm
The frames have changed a bit since then, shape wise etc and there is a bit more 'meat' around the specific bolt hole that failed in that thread.
I have a 2020 160 Action Team and so far have not needed to do anything to the bolts holding the plates to the motor, I have taken the motor out a few times, but always tightened the main bolts back up to 11Nm and have not had any creaking.
As Cube's carbon frame warranty is only 3 years, I'd rather err on the side of caution.
There is always the possibility of them being able to be torqued up higher, but I'll stick with what I know works.
2020 was the first year they used carbon on the Stereo hybrids, they were aluminium prior to that, so potentially where the higher torque figures come from.
20Nm is a Bosch recommendation, but they say to check with the frame manufacturer