Comment by cubefox

In case of Stanislaw Lem I would say that when things are hard to understand, they are usually also hard to understand for the main character. Who is intelligent and tries to make sense of things in first-person narration. E.g. Ijon Tichy in Wizja Lokalna (Observation on the Spot), Kris Kelvin in Solaris, or the fictional author of the "Memoirs Found in the Bathtub".

In cyberpunk the characters themselves understand the world they are living in, and they are usually not encountering any hard to understand events. The narrator just doesn't try to simplify or explain things to the reader when they are obvious for the characters. Similar to how books set in the present don't try to be science fiction for people in the past, even though they would be, and therefore don't avoid or explain modern terminology.