Let's go through this logically, I'll lay it out so everyone can understand.
Previously MS engineers though read/write was only unidirectional, and the APU to ESRAM bandwitdth was pegged at 102GB/s, the reality was that it was bidirectional, regardless of what they thought which meant it was actually 204GB/s which lines up perfectly to 800MHz for the GPU.
Now we have information saying that MS engineers have discovered that information is bidirectional (not that it is now, just that they found out it is) and the consolidated read/write bandwidth is 192GB/s which is 96GB/s in each direction. That figure is lower than the old 102GB/s figure and it implies a GPU clock of 750MHz.
So yes, 192 is higher than 102, but it is not comparable as the latter is unidirectional bandwidth and the former is bidirectional. The fact that MS engineers didn't know or realise that you could run read/write operations simultaneously is irrelevant because it was still possible, this is not a new addition, more a new discovery. Think of it like a scientific discovery, just because an apple fell on Newton it doesn't mean he invented gravity, it existed before that, he just discovered it.
So we've actually gone from 204GB/s to 192GB/s or on the old measure, 102GB/s to 96GB/s, it's not that hard to understand. Leadbetter has this one wrong and he should try to correct it.