These number represent (I haven't tested them for accuracy but they seem like a good starting point) what the CPU considers a mismatch. In the truest sense of the word mismatch. Like a quadriplegic girl guarding Kobe mismatch.
The mechanic should only come into effect when your getting back on D and your point guard ends up guarding the center. The mismatch mechanic kicks in and the CPU calls a quick post up for the "mismatch"