To use the term “approved manual” is a bit tricky in this case. You were referring to the FCOM . It is not approved in the same sense the AFM is ( you can see that each documentary unit in the AFM has the “approved” next to it ) . The FCOM does not go through this process so it is not legally binding .
Another thing I noticed is that the landing gear placard speeds ( on the left side of the instrument panel) are as in the AFM. the only Mach limitation you see on the placard speeds is as it is in the AFM ( only the VLE)