I'm not surprised; even here in the US Colleges and Universities are now requiring a mandatory online elective in basic computer proficiency as more and more classes go digital. The Uni my younger cousin went to has a mandatory questionnaire that asks about computer proficiencies like this, in addition to basic terms like webcam, scrolling, media player, etc. And when I took up a side course at a local college for learning another language, they also had a similar mandatory computer proficiency questionnaire.
So even if it IS Japan, I'd believe it of students in the US too, given that the results of the questionnaire stated I was in the top 10% of current students (at that local college) who knew most of the standard programs (MS Word/Excel/Access, Email systems, Skype, etc), basically all the definitions (some on the border between being "tech savvy" and being a casual computer user), and most shortcuts (I only missed out on 1 or 2 Win10 era shortcuts).