Ok only looked at your excerpt.
Still not clear on whether we’re talking monitoring BE itself or monitoring during GERD for BE.
It's specifically talking about people with Barretts. Generally you monitor with annual endoscopy (or even every six months if the segment is long enough, like mine was) to determine if there is dysplasia. The progression is Healthy esophagus -> Barretts Esophagus -> Low Grade dysplasia -> High grade dysplasia -> cancer. You aren't monitoring for dysplasia specifically unless you already have Barrett's, then you watch it like a hawk.
Honestly, to me these recommendation seem like they were written by the insurance company to try to minimize the number of treatments they have to pay for.