Two quick points, given the massive impact of this eveny it is clear to say many critical systems run windows. Meaning them being windows doesn’t make them any less “actual computers”.
Also, the OS in this event is irrelevant. They could have botched an update to their Linux version and crashes all the Linux boxes leaving windows untouched. This was not a result of an issue of any OS but a bad update.
Neither does window. A file deletion did not cause this. A human at Crowdstrike uploaded a bug to production. Bugs in production can happen on any OS, this is just a terrible, terrible look for Crowdstrike because they seriously messed up