Note that it's currently the only comment from that user, and the username looks like a random throwaway (unless vb6sp6 is a big fan of Visual Basic 6.0, Service Pack 6).
But maybe it's an obvious guess to a wide number of people with knowledge of that general ecosystem of companies.
I'm guessing it was someone within Verizon up-stream, given they were thrown under the bus. They'd know who was to blame, would potentially resent their employer being linked, and could pass off their comment as a guess if pressured.
But maybe it's an obvious guess to a wide number of people with knowledge of that general ecosystem of companies.