The article is interesting and provides a fair picture of the narrow McCollough Effect. It would be even better if it pointed to the broader field of contingent adaptation, and if it cited Keith Humphrey's review chapter:
Humphrey, G. K. (1998). The McCollough effect: Misperception and reality. In V. Walsh and J. Kulikowski (Eds) Perceptual constancy: Why things look as they do (pp. 31-68). New York, NY, US: Cambridge University Press.