/usr/share/kconf_update/plasmaVolumeDisableKMixAutostart.pl is in plasma-pa 4:5.8.6-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #! /usr/bin/perl
use strict;
print "AutoStart=false\n";
print "startkdeRestore=false\n";
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