People like you are what keep me coming back to sites like this. Thank you for actually reading the paper and discussing reality with us.
FYI it was very little effort. You can do it too! I followed two links to the paper, looked for "how did they test this thing" (because I was skeptical about that bit), then skimmed the three paragraphs in section 4 "Feasibility Study". I'm hoping that people that care more than I do will read more.
Sure, a positive interaction and rewarding something important. At the same time we shouldn’t forget to aim to make this behavior commonplace.