IFMU,
This is only speculation, however it would appear that the text on the web page is a slightly crude translation of writings from another language, perhaps Russian.
The first quote may relate to a Kamov affectionado believing that a helicopter with tail rotor is unable to stay on target under gusty conditions.
In the second quote he may have used 'inertia' when he meant 'torque'. I understand that the coaxial has a very powerful yaw authority, due to the differential torque. In autorotation the pedals must be reversed. It appears that Kaman and Kellett initially thought they could get away with shorter tail booms because they did not have a tail rotor. Look at the size of Flettner's vertical stabilizer.
Just speculation.
Dave