I think that walkthrough you linked was outdated or I didn't see anywhere that lets me use source type of custom.
I decided to go a different route.
I created a full-width section with 1 column and marginless. I then used the Woo Commerce short code for displaying categories.
[product_categories ids="1,2,3,4"]. WC Online Documentation
Next I added the woo commerce template file
content-product_cat.php to my child theme and adjusted it a bit to fit my needs, then brought in the appropriate CSS needed.
NOTE: I also just realized I was trying to use "The Grid" and not "Essential Grid". I may investigate that again, but I have it working as stated above.