Reaction Enthalpy for oxide formation

In the “Calculate reaction” section: For the " 4 Fe + 3 O2 → 2 Fe2O3" reaction it is showing both calculated and experimental formation energy. Is it considered the MP_advanced correction and Mp_anion correction for Fe2O3 with DFT+U energy? or only the DFT+U energy and MP_anion correction?
And what is the energy for the O2 molecule here?