In think that Electro is not speaking from his/her strengths here. That is to say, he is making sweeping generalisations.
The early IBM Machines (the IBM Boeblingen Development Laboratory invented the the Word Processing) date from the 1960s. The first one being the IBM Magnetic Tape Selectric Typewriter - 1964.
By the time of Office System/6 (1977) and Displaywriter System (1980) the IBM Word Processors were very sophisticated machine indeed.