Obsolete information in debian-handbook? (linux-patch-* packages)

Hello.

In the context of kernel patching, the Debian Administrator's Handbook
mentions linux-patch-* packages. I have never heard of packages like
that, and no such packages appear to exist in any current Debian
release.

Is the information in the Handbook obsolete?

The section in question is here:
https://www.debian.org/doc//manuals/debian-handbook/sect.kernel-compilation.en.html#sect.kernel-patch

Please CC me when replying. Thank you.

Regards,
Samuel Plavec