Well, truly altruistic until you tell someone that you're a regular blood and plasma donor. But, like said before, you could simply refuse the compensation.
If that would disqualify then so would feeling good about it without telling people, it's the same kind of compensation.
And he could even tell people the same thing without really donating, so the act itself is actually altruistic after all.
I'm not sure if that's the same for me. Just feeling good about it yourself says more about how you wish to view yourself as a good or moral person. Telling others about your charitable acts reflects more on how important we find showing that we are good and moral people to others.
Of course I don't intend to bring the character of the parent to question, I think it's great when anyone engages in charitable acts.
It's just interesting to me to think about the fact that compensating someone for what was once charity could dissuade them from donating. If compensation causes you to avoid giving blood, which is saving lives, because you no longer get the warm fuzzies were you ever acting altruistically to begin with?