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/KNOPPIX/etc/apt/apt.conf.d/00knoppix has the correct mention:

// Debian/stretch is the "stable" release in this version of KNOPPIX!


The following two binaries contain the string:
(1)...

The above sources.list has not been updated for a long time since squeeze.

The Chronology of Debian releases are:
bo/ 1998-12-08 22:17 -
hamm/ 1999-02-15 19:59 -
slink/ ...

This is the sources.list for 8.2:


# Debian/Squeeze is the stable base for this installation
deb http://ftp.de.debian.org/debian/ oldstable main contrib non-free
deb...

In the middle the release Repository List has changed.
Now:
stretch→ oldstable
Buster→ stable
bullseye→ testing
sid→ unstable
experimental

So should I restructure the repository list?