Dante's intended meaning being
A Twist on the Concept of Critical Mass
Although the twisted idea has more specific particularities :
What Dante wishes to express through Critical Diversity is an enabler for a certain form of emergent phenomenon that can appear through presence and interconnectedness of diversity, rather than a critical mass of numbers alone.
Dante also likes to combine it with notions expressed through Integral City, understanding potential value systems emerging through the complexity of the type and diversity of infrastructure present in an urban settlement. ( https://en.wikipedia.org/wiki/Integral_City )
It may be extended through Online Communities, and social dynamics bridging Online and Offline dynamics.
Dante likes to use such concept within the realm of distributed and emergent commons oriented subcultures.