But you weren't willfully lounging elsewhere on the ship having decided to NOT go to muster and then deliberately not going to the replacement drill.
Some cruise lines WILL boot you off the ship for drill non-compliance. See
https://www.cruisecritic.com/news/news.cfm?ID=4734
I think the issue with our particular cruise was that the ship was delayed by fog about 5 hours I believe. So, the normal flow of things was disrupted. I am sure there were a lot more people than usual at the makeup drill because of this. And maybe ships officers were more understanding of the situation if people missed the makeup than they would normally be.
But I read the article that you posted that was dated 2012 and it's really interesting for a couple of reasons. First, it says that:
But while the IMO states that musters are a must, enforcement may be another story. "The only enforceable piece is that the ship completes the passenger muster as required," said Lt. Cmdr. Dan Brehm of the U.S. Coast Guard's Cruise Ship National Center of Expertise. "What they do to the passengers who don't show up is a company policy at that point."
And
"Not all lines use an emergency system that relies upon an actual roll call; instead, they have crew search all areas of the ship," Lyons told the publication. "If nobody is found, then everyone must be in the muster stations. In that scenario, a roll call will not be taken. (In a real situation, however, it is likely their method of searching would also be supplemented by an actual roll call.) Some lines that take roll calls and identify those who skipped the drill will hold a special meeting or drill the next morning; other cruise lines simply ignore the fact that you didn't attend."
IMO, it's crazy that all cruise lines don't take a roll call during the drill because I would think that in real life, they would want to take a roll call. So, doing so during the drill ensures that people are there and allows the crew to practice. And I agree with whomever else said that the Captain can kick you off. IMO, he should be able to kick you off for any reason that is for the good order of the ship. But, honestly, if the cruise lines really felt that the drill was important, they shouldn't have the bars open beforehand and allow people to get completed hammered before attending. I have been at drills with a lot of hammered guests that are disruptive and not paying attention to a thing that is said.