It is a complete oxymoron, there is no such thing as biscuits & gravy 'English style' ...
To translate properly that would be scones and gravy, and yes, we do use them in savoury cooking such as beef cobbler for example, but never just with the gravy.
Full marks to the staff for coming up with an excuse, but no basis in reality.
I've spent too much time in Texas over the last 15 years to even think about ordering something like that on a cruise ship, doomed from the outset...