Thanks for setting this up, Emile!
To save everyone some time, from Google’s guide on how to tell if you have universal analytics:
To find out if a web property is using Universal Analytics, sign in to your account and go to the Admin page. Select a property from the dropdown in the Property column.
A Classic Google Analytics account has an option in this column called Tracking Code. A Universal Analytics account has an option called Tracking Info that includes more Admin settings like Session Settings and Organic Search Sources. These additional settings are only available to Universal Analytics properties. If you have these settings, you have a Universal Analytics property.
I set up my analytics code when Tindie first launched analytics support, and it’s a universal one, so it’s likely you have universal analytics too - but it’s definitely worth checking to be sure.