May be the manual is a mistake, if you set the DX9 to 11ms does it bind OK, the frame rate is apparently set by the Rx and DSM2 is 22ms, DSMX is 11 ms or 22ms and DSMR (Surface Radio) is 5.5ms.
I had never hear of DSMR, I never panic if I'm bound at 22ms at that speed the Rx is still updating 49 times a second and that is miles faster than I can react.