This has no bearing on foreign ports, as the CDC has no jurisdiction there.   These requirements were known, in general terms, a year ago, and these instructions still only tell the what is required (the same as the NSO and the CSO), which is what the CDC is competent to promulgate.  The how is still up to the cruise lines, just as it has been since last April, and even when it was stated about 2 months ago what the "phase 2" would require, the cruise lines have not done any pre-planni