People confuse "balanced" with "having XLR inputs and a 4-pin XLR output". It's an easy mistake to make - I've done so myself on several occasions. Plus there's still some debate over what constitutes a "true" balanced design... see the vigorous arguing over Woo Audio's WA22 "balanced" output, or the Bryston BHA-1 which is pretty much a balanced input stage and output stage with an unbalanced middle section (therefore a conversion from balance to SE then back to balanced).
So what about the A18? Does it have a balanced middle section? If not then why would they make D18 fully balanced?