According to the latest newsletter, they've relaxed this restriction:
I assume the reason why they may have restricted it in the first place, is that the device is somewhat new and unproven and since Barrett's is a higher risk scenario, they'd want you to go with more proven techniques (i.e. Nissen Fundoplication).
But, I guess they've seen enough proof at this point that Barrett's is not a reason for exclusion.
Follow my journey: http://acidrefluxjournal.com/