Welcome @JohnCubed
I don’t know if lspci is expected to be available in the Debian template by default. (I don’t believe so.)
If you want to install it, lspci is part of the pciutils package.
# in the Debian template
sudo apt install pciutils
Source (the package info is at the very bottom of the page):
https://manpages.debian.org/bookworm/pciutils/lspci.8.en.html