Historically that doesn't go well.
Yeah, but historically those 1% didn't have fighting robots to defend their wealth...
The blog standard is far superior, where usually the incorrect section is stricken through (but left readable) with a statement right below saying what they got wrong. The key is that the correction is attached to the original media, far stronger a correction.
For a newspaper to make a correction, they have to do something that will be seen, and evidence is left behind of what was there before. When you change something online, you can just change it and deny that it was ever anything else.
That said, it sounds to me more like a course that teaches you what calculus can do, not a course in how to do calculus. It is of different value, but not necessarily less, especially for people taking calculus for different purposes.