By saying they've released "source code" they're claiming to have somehow got hold of extra information (i.e. done some old-fashioned journalism and got hold of

By saying they've released "source code" they're claiming to have somehow got hold of extra information (i.e. done some old-fashioned journalism and got hold of C code or whatever, containing comments and symbols and human information about intent). In fact they've just downloaded a publicly available binary and disassembled it.