Reminds me of the old phrase, "luck is when preparation meets opportunity". The strategies discussed in this article seem to maximize the "opportunity" side of that equation.
Just as an obvious example, if you were looking for career opportunities to improve the lives of people, and you spent your time volunteering part-time in order to improve your chances of doing so full time, then accepting an opportunity in the space would hardly be opportunist.
A proper opportunist (what the word means) grabs opportunities for the sake of and in spite of being morally obligated to take other things into consideration.