Besides your singular anecdote, do you have any evidence that frontline staff were notified of throttling? Everything that's come out so far says otherwise. It's a key part of the class action lawsuit to which Apple agreed to settle.
It's possible that some staff deduced that replacing the battery would help, based on personal observations, but they were never advised by corporate to do this as policy. As such, the vast majority of them were not recommending battery replacements.