But doesn't Ctrl+Alt+Del bring up the screen to switch users or sign out? "Task Manager" is one item in the list of options you get, but it's not the main one or anything, in fact it's the last:
https://www.lifewire.com/thmb/hzx6btMYEqZJfSAL3WVxXuW3-jw=/1...
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The author may just be showing their age a bit. That's what Ctrl+Alt+Del does on modern versions of Windows, but from Windows 95 to Windows XP (inclusive) it directly launched the Task Manager.
Would have made more sense to say Ctrl+Shift+Esc since that just directly brings up the task manager. All in all I would say it is a slightly weird title, but I assume enough people get what they want to say with it.