Sorry maybe I am confusing you. The config file that I posted, works fine. What I request actually responds. So, if I were to request www.domain.tld, the Apache server behind Nginx responds with the correct website for www.domain.tld. However, if I were to delete the config file for domain.tld from nginx and I tried to browse to that domain again, nginx would forward the request to another (seemingly random?) website on Apache behind it.

I would think, deleting a config from Nginx, it would simply stop forwarding requests for that cofig.