Dell wifi interface not showing after loading module

[Dylanus]

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glx-alternative-nvidia:
  Installed: (none)
  Candidate: 0.8.8~obs
  Version table:
     0.8.8~obs 500
        500 http://download.opensuse.org/repositories/home:/stevenpusser:/new-hardware-support/Debian_9.0  Packages
nvidia-driver:
  Installed: (none)
  Candidate: 390.87-2~obs1
  Version table:
     390.87-2~obs1 500
        500 http://download.opensuse.org/repositories/home:/stevenpusser:/new-hardware-support/Debian_9.0  Packages

Does that mean the driver is installed?

[stevepusser]

...

Does that mean the driver is installed?

Well, what do you think this means?

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nvidia-driver:
  Installed: (none)

It seems pretty obvious to me. Now we have to figure out why. Those results should also show the older stock Debian versions available, but they don't, so something is wrong with your repositories. Let's find out what.

Can you show the result of

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inxi -r

(install inxi if necessary first--if you can't install inxi, something is really wrong)

[Dylanus]

Of course. Sorry, I wasn't paying enough attention.
This is the output:

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Repos:     Active apt sources in file: /etc/apt/sources.list
           deb http://ftp.au.debian.org/debian/ stretch main
           deb-src http://ftp.au.debian.org/debian/ stretch main
           deb http://security.debian.org/debian-security stretch/updates main
           deb-src http://security.debian.org/debian-security stretch/updates main
           deb http://ftp.au.debian.org/debian/ stretch-updates main
           deb-src http://ftp.au.debian.org/debian/ stretch-updates main
           deb http://ftp.au.debian.org/debian/ stretch-backports main
           Active apt sources in file: /etc/apt/sources.list.d/home:stevenpusser:new-hardware-support.list
           deb http://download.opensuse.org/repositories/home:/stevenpusser:/new-hardware-support/Debian_9.0/ /
           Active apt sources in file: /etc/apt/sources.list.d/slack.list
           deb https://packagecloud.io/slacktechnologies/slack/debian/ jessie main

Looks to me like it's fine. I remember some changes when I updated after adding that file as well. Should I put the line directly in sources.list?