Since v11.5, desktop automation has been removed from the standard Monarch/Modeler functionality. Unless your IT department have negotiated very hard with Datawatch, then you won't be able to control Modeler via script.
If you have the version that supports automation, then the syntax shouldn't change too much, and a straightforward table export like this should work. So my guess is that you don't have the automation enabled at all.
If you would like some advice about the options, please do drop me a line..