We just got on Silver Whisper in Copenhagen. Approximately 20 days ahead of departure we got an email from SS stating very clearly that we needed to provide a negative test (either by a 3rd party or a proctored self test) that was administered within 3 days of departure. And just as clearly they stated that they would not be doing any testing pierside and if you arrived without the negative test you would be denied boarding. There were also add'l rules around fully vaccinated ( 2 doses) and vaccinated up-to-date (doses + booster). The email was very clear..you must come with the negative test or you are not getting on the ship.
At the pier there were various stations set up that were manned by Seabourn personnel and they asked for each bit of documentation (completed health questionnaire provided at entry to terminal with temperature taken as you turned it in, then the vaccine card, then your negative test results and then your passport). At each station your docs were scrutinized but it was all very professional and we were through these hoops in about 10 mins total.
The one thing that was different was the amount of time it took to get access to the suites. Whisper is a small ship but we weren't grated access to the suites until about 4:20 PM with the mandatory 2nd half of the life boat drill happening at 5:00 PM so it was all a bit of a rush.
But we are having a wonderful time and it is worth the hassle for the fun of the cruise.