I have just spoken to Seabourn to clarify dates as on the Encore for a month before you board.
She said she attended a meeting at the start of the week and then referred to the email sent out following the meeting to confirm the restaurant will close on Encore on February 17 and the plan “is for the work to be done in a week but obviously work can overrun” 😀
She also confirmed the new restaurant will additionally be using the outside seating.