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Fluent v6.2 was about 2004-ish so was very likely about the first release of the population balance models, they may even have been UDF only at that point. Fluent v6.0 was 2001, and brought the multiphase models into the unstructured code. As I don't have the paper it's hard to comment, and having tried a couple of times, I'm straying very close to "engineering insight" and "proprietary knowledge". 

Are they adding a model correction or damping into the maths? Ie are they shifting a correlation by some factor or just damping a feedback loop?