1. It's slang, so it's of more interest to foreigners who just want to make sense of what they hear compared to native speakers who wouldn't need a dictionary for this.
2. I've never heard any of my Japanese acquaintances actually call this phenomenon ワープロ馬鹿, they all say they've just been using computers too much (or handwriting too little) in their lives.
Edit: interestingly enough the most complete I found in Japanese about the word describes it differently:
かなり昔のことになるが、ワープロが普及しはじめた当時、ワープロの使い過ぎで正しい漢字が分からなくなることを「ワープロ馬鹿症候群」と呼ぶ、という話を聞いた覚えがある。例えば、ワープロで「あらり」を変換してみても、「粗利」なのか「荒利」なのか正しい漢字が分からないので結局は辞書で調べないといけない、といった具合の症状だ。 (https://xtech.nikkei.com/it/article/COLUMN/20070220/262584/)
Short rough reinterpretation: back at the time of electronic word processors, not knowing which of the homophones was the right one to use was called ワープロ馬鹿症候群