The "Desktop command: LeftClick" step emulates a real mouse click as an actual user would perform. Thus it requires an unlocked and visible desktop. The RadInput step was recorded because of an enabled RadControl Translator
that opens up the element to work with Test Studio.
If you were to disable that translator from Project Settings
and re-record the text input step, it will appear as a standard "Set text" step. This step will have the "SimulateRealTyping" property to toggle.
What is likely easier, however, is to explore the VNC option as mentioned in the KB article previously linked in this thread.
the Telerik team