Not necessarily, much like every human does not know pharmacology, genetics, robotics or other specialties that could be used for self improvement. Including social engineering and programming.
What you're describing is a particular kind of superintelligence, recursively improving kind.
Between that and general intelligence is another gap.
Humanity as a whole can improve itself indefinitely, there is little doubt about that. For robots, there is no distinction between a single robot and robotuity, as software can be replicated cheaply and quickly.
What you're describing is a particular kind of superintelligence, recursively improving kind. Between that and general intelligence is another gap.