I've done some research, and seems like some countries via Nordvpn actually only give access to US titles. Since I'm not located in America I took the appearance of these new titles as a sign that things were working as intended, even though I was actually never accessing the catalogue I thought I was.

Sorry for not responding for so long, I originally logged in on my phone so I didn't end up getting any notifications.

I'm using NordVPN, at the address 195.181.167.167. It's Spain #58.

Sorry to make an entire post for this small subject, but I'd just like to mention that The devil is a part timer is in fact available on spanish netflix, despite the site claiming otherwise.

Here's the page:
http://unogs.com/video/?v=80006149