Cock-up indeed, even with disclaimer, but don't blame the teacher
"Either the team responsible for this cock-up didn't attend - or those teaching the courses need to be fired."
As a (senior) lecturer, I cannot accept responsibility for all cock-ups my students make after following or even passing my course. The people teaching the course in source attribution may have been sterling, but let us not forget a student's ability to forget, misconstrue, or otherwise garble any information or skills imparted to them. I have seen all too often that students learn things only to the level to pass the exam, and then get totally plastered to ensure they erase that section of memory as effectively as possible. Fortunately, there are also many students who really want to learn and work hard at it. I have long ago decided to focus my efforts on the latter class, and lose no sleep over the former. After all, they are grown ups, they are responsible.
Many image search tools exist, they should have been able to find the source. If anyone is to be fired, fire those responsible.