Clearly not happened
Best you take it up with Lord Levene and his staff - according to his Annual Reviews, and the progress made against defence reform recommendations, he has reported the following against the one you quote (Recommendation 11a):
In 2012 (First Review)
A Liability Review of all civilian and non-front line military posts from 0F5 up to 2* has been undertaken. The scope of this work has
increased and completion is now expected by end 2012.
In 2013 (Second Review)
The Liability Review is complete. Numbers of senior posts will continue to be monitored by DS Sec and HRD and implemented through
Command Plans.
In 2014 (Third Review)
Complete: Military starred strength has reduced from 490 in 2010 to 448 by Oct 2014. Alongside this the equivalent SCS strength has reduced from to 309 in 2010 to 271 by Oct 2014.
Detail can be found
here.
Whilst it may be that one particular rank in one Service currently is 'over manned' this may be because 1* RAF officers are filling more than their "fair share" of joint appointments.
But don't let facts get in your way.....