Thanks for the quick response, Hogo!
I wrote in a hurry and didn't use the right words; sorry for that.
What I heard was that two fresh AAs could trigger the low-battery warning because even their full voltage is close to a depleted lithium cell. I am wondering if that happens regularly, or if it was a unique experience that made its way onto the internet.
Perhaps a better way to ask is this: Are there any issues with the AA setup triggering the low-battery warning prematurely? I ask because I know that it has happened at some point, and it's what keeps me from ordering a AA tube.