Hi Luke,
Thanks for reaching out! You’ve got it right–with the exception of CSV-based imports, event imports of all types are handled by our Event Aggregator add-on. This add-on operates as an extension of our free plugin The Events Calendar, so you don’t need to purchase Events Calendar PRO just to use Event Aggregator. Feel free to compare our two calendar offerings and select the one that’s the best fit for your needs!
If you’re not sure what the differences are between our two calendar plugins, we’ve provided a feature breakdown on the Events Calendar PRO product page:
https://theeventscalendar.com/product/wordpress-events-calendar-pro/
We’d be glad to answer any specific questions that you might have, as well! 🙂 Thanks again, and please don’t hesitate to follow up if you should have any other questions!