[felixfbecker]

It depends on the context. A university degree in Informatik will obviously not be about using MS Office. But 7th grade Informatik is. 10th grade Informatik introduced programming at my school. A trained job “Fachinformatiker für Systemadministration” will be about sysadmin work.

[stormking]

To 90% of the population, it's not "obvious" or we would not need T-Shirts labeled "I will not fix your computer for you".

Even a common programmer does not use any actual "computer science" 99% of the time and your typical sysadmin type probably never knew any. So it's simply wrong and confusing to use the same word for it.