This is an AppleScript that from the selected text removes double-bracketed text. So “[[word]]”, etc., is removed.
tell application "Microsoft Word"
activate
-- remove bracketed text
set docRange to text object of selection
set myfind to find object of docRange
set properties of myfind to {match wildcards:true}
execute find (myfind) find text "\\[\\[*\\]\\]" replace with "" replace replace all
end tell