Best way to insert MOGRT into sequence? (Are docs out of date?)

I'm working on automatically inserting MOGRTs and setting values programatically with a script. 

I don't see anywhere in the official docs for how to do this. 

https://ppro-scripting.docsforadobe.dev/index.html

The only MOGRT related function I see on here at all is "getMGTComponent" which is to select components and properties of an already-inserted MOGRT trackItem.

Now, I AM actually familar with the sequenceItem.importMGT method. I wonder tough, has this function been deprecated? I can't find it in the docs. And I am having some issues getting it to work. 

The issue I am having with importMGT is that in addition to adding the MOGRT to the timeline, it ALSO imports duplicate projectItems into the project of the entire track V1 up to that point. (FWIW, I am inserting the MOGRT on V2). 

Any idea why this might be?  

Thanks,

-dv