Most courses are like that. If there are no significant changes they'll just update the titles.
Exactly. Usually they change a few files add some extra details, or bugfixes - though or if a major frameowork used changes, at least they add some info related to those changes, but in this case not even that happened
My favorite, is when they reorder stuff, so it's mostly the older 1-2 years old course, but in the meantime some genius figured that from a good teaching point of view things need to be reordered. Plus sprinkle-in some additional shorter videos in between here and there

Of course no point in redoing course in any of these cases.