Yes, mining software can be designed to avoid detection by the task manager.
Yes, mining software can be designed to avoid detection by the task manager.
Sure, you can check for unlisted CPU/GPU usage by using system tools like Task Manager, Resource Monitor, or third-party software such as HWMonitor or Speccy. These provide detailed insights beyond what's shown in the Task Manager.
View by process remains within Task Manager. Therefore, no, "any application" cannot conceal itself from it.