Backports default for nala backports install

I always used the Volian repo, but randomly stumbled across the realization that I can use Debian backports instead. I decided to make the switch and also deleted nala.list from /etc/apt/sources.list.d. Now though, when I run nala update it jumped from 10 suggested updates -> +120. I did some digging and it's recommending backport versions as a default. I tried to pin in /etc/apt/preferences.d/99-backports but it doesn't seem to be helping:

Package: *
Pin: release a=bookworm-backports
Pin-Priority: 100

Package: yt-dlp libreiserfscore0 tmux nala btrfs-progs
Pin: release a=bookworm-backports
Pin-Priority: 500

Package: *
Pin: release a=bookworm
Pin-Priority: 500

Is this the right file to edit or is there a different location for nala? Was there something inside of nala.list that I can replicate re: pinning? Gracias