Earlier quoted context omitted.
pypy is dynamic analysis.
Semantics. Pypy's RPython dialect is "a restricted subset of Python that is amenable to static analysis", to quote the PyPy website.
RPython and Pypy are different things.
RPython is a restricted subset of python indeed, but its purpose is to be a toolkit for implementing virtual machines. It is not and does not aim to be a general-purpose programming environment.
PyPy is a JITed Python runtime implemented in RPython.
The relation between PyPy and RPython is more or less the relation between CPython and C.