While the OED may be considered the definitive source for the vast majority of words, many entries reflect the last print publication in 1989, and are not as in-step with modern usages. Language is continually evolving, and as always, it is best to consult a variety of sources.
Article for homogenous only has two meanings listed: 1. Biol. = HOMOGENETIC 1. 2. Surg. Of transplanted tisssue: = HOMOPLASTIC a. 2.
I suppose the confusion in everyday speech made it into American dictionaries, but I still find its appearance in a magazine perceived to cater to intellectual snobs amusing.