Y not said: “..What I meant was unselfishness in all its aspects..”.
One’s intention is ALWAYS contaminated to some level unless Tilakkhana are FULLY comprehended, which happens only at the Arahant stage.
And that level of ignorance is embedded in sanna at ALL times. One may think that one is giving without any expectations of getting something in return, but that is not correct. However, that is how one makes progress. That act of giving has merits; it will make it easier for one to comprehend Tilakkhana. That is a part of completing the mundane eightfold path.
You may be able to get a better idea when you listen to the second discourse. If not, I can incorporate more on this issue at the next discourse. This is an important but a deeper point.