This question is worth looking at directly. There's a whole lot of code running inside your Onkyo receiver. All these menus, network connectivity, and applications (yes, just like the ones on your computer, phone, etc) require thousands of lines of code. When Onkyo says they've "fixed" the networking problem, this only means that their code passes their test suite. As we've seen here in this thread, one problem may not be identical to the other. Specifically, the two problem criteria outlined as "Set 1" and "Set 2" in my previous post are, in all likelihood, completely separate problems.
In more concise terms, a fix is only good if it addresses the problem you were having