In other words, it is a sequence of words entirely devoid of any meaning. If it can only possibly convey an idea to someone who already knows that idea and knows that idea is the one to be conveyed, then the words carry zero bits of information.
Just to elucidate the general principle a bit: sometimes a reminder or different perspective of past learning using vocabulary you already know can be valuable. Humans aren't perfect decoding and recall machines. And that's assuming the author and target audience learned the advanced vocabulary in the exact same way, which is unlikely. Sometimes you need to fill in gaps in some of your audience's knowledge, perhaps that they should have learned but didn't, maybe because they or their teacher was having a rough day in class.