He did exactly like PTM told him, so doofus is PTM

Why do I still get this after successfully applying the key update?

# apt-get update
Get: 1 http://security.debian.org stable/updates Release.gpg [189B]
Get: 2 http://ftp.debian.org testing Release.gpg [189B]
Hit http://security.debian.org stable/updates Release
Hit http://ftp.debian.org testing Release
Errhttp://ftp.debian.org testing Release

Ign http://security.debian.org stable/updates/main Packages
Get: 3 http://ftp.debian.org testing Release [35.4kB]
Hit http://security.debian.org stable/updates/main Packages
Ign http://ftp.debian.org testing Release
Hit http://ftp.debian.org testing/main Packages
Hit http://ftp.debian.org testing/main Sources
Fetched 35.6kB in 0s (58.3kB/s)
Reading package lists… Done
W: GPG error: http://ftp.debian.org testing Release: The following signatures were invalid: BADSIG 010908312D230C5F Debian Archive Automatic Signing Key (2006) <ftpmaster@debian.org>
W: You may want to run apt-get update to correct these problems