I believe that there is some confusion.
One cannot attain the CISSP without an endorser. There is no way around this.
The line "CISSP concentrations do not require an endorser." refers to the ISSMP, ISSAP and ISSEP. All these are called concentrations and one must be a CISSP to attain them.
@AndreaMoore Could you feed back to the correct folk that the grammar here may be misleading.