On FME Cloud you do not have access to the FME Server System Database.Therefore it is not supported to migrate the job history from one instance to another.
The PostGIS database that comes with an FME Cloud instance is provided for rapid prototyping and getting started with scenarios quickly.It is not the same database as the FME Server System Database.
Hi@virtualcitymatt!
I do not recommend importing historic job history into your new instance (as described in the article you linked).However, should you decide to proceed I would suggest that you backup your instance beforehand and do some testing afterwards.
We have instructions on how to access the fme cloud database here:https://docs.safe.com/fme_cloud/FME_Cloud/Content/About_Instances/Connect_to_PostGIS_Database.htm#Connect_to_database
Hope that helps!