Dhammā can be analyzed at various levels and in various ways. The above quote is one way to express it.
Dhammā includes kamma bija, which are in vinnanakkhandha (our future hopes and expectations; of course, expectations do not materialize “as expected”). Those are energies. Kamma vipaka materialize due to them.
Dhammā includes memories, which do not have any energy. The other three khandhas are included in memories. They are also called nama gotta.
Finally, Nibbana (asankhata dhatu) is also grasped with the mind. “Mananca paticca dhammeca..”