I defer to your knowledge. I am not a lawyer. I don’t even play one on TV.
In any case it is probably irrelevant. The attorney-client privilege can be waived by the CLIENT, and in this particular case the client isn't Lisa Page -- it's the FBI. U.S. Attorney General William Barr is the one who has the ultimate decision about whether to invoke or waive the privilege ... and what do you think he'd decide? LOL.