Pink, seasonal discoloration does not always characterise Portulacaria pygmaea plants. Dull green with greener mottling, as well as yellow green in brighter shades of newborn leaf-pairs also announce themselves, or shout in the wilderness when the going is good.
Harm does come to a leaf here and there, wherever it grows. Whether an ant will inflict it isn’t certain.
But below the leaves bits of weathered caudex tell of the plant's resilience, no matter what. Demanding respect (Williamson, 2010; iNaturalist).