I believe from reading the WiB review-of-the-review was that Richards did understand the SGR issue - but realized that the QEs could never get to their intended SGR with a 48-aircraft force.
This is the conundrum in SDSR 2015: particularly if UK goes to two carriers, substantially more JSFs will be needed. But unless the FJ force is expanded compared to SDSR 2010 plans, that may mean that the JSFs oust Typhoons - and more money for FJs is unlikely given the urgent needs of MPA in particular and ISR in general.