Intentional obfuscation happens all the time in politics, the media, history, law, science, medicine, programming, and so forth. Unintentional obfuscation via compliance probably happens equally as much or more. Both cases are covered in, Repeat a lie enough and it becomes the truth. Obfuscation is definitely a thing in education too. See for example:

My question is, how deep and wide does it go? How about more generally in education and information sources such as books, articles, videos? For sure much of what the author of that article goes on about happens in math, science, engineering, medicine, pharma, etc.

And something else that happens is obfuscation of obfuscation. If some party has gone to great depth in making lies into accepted truths, it is likely that party will also go to some effort in hiding that they did it.