FC6: Metadata file does not match checksum

[Michael Schwendt <mschwendt tmp0701 nospam arcor de>]

Revisiting the annoying "Metadata file does not match checksum" problem,
since it just came back here like this:

$ ll /var/cache/yum/updates-released/
total 488
-rw-r--r-- 1 root root      0 Oct 10 12:28 cachecookie
drwxr-xr-x 2 root root   4096 Oct 10 12:28 headers
drwxr-xr-x 2 root root   4096 Oct 10 12:28 packages
-rw-r--r-- 1 root root 461224 Oct 10 12:33 primary.xml.gz
-rw-r--r-- 1 root root   1197 Sep 19 00:47 repomd.xml

The cached repomd.xml file is out-of-date from September 19th, and all
the mirrors offer much newer repodata from Oct 8th. The mirrors are
not to blame here, since Yum does not consider downloading a fresh copy.
Instead, it seems it tries to fetch metadata files which match the old
repomd index:

http://ftp.rhd.ru/pub/fedora/linux/core/updates/6/i386/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.xml.gz            100% |=========================| 450 kB    00:01     
http://mirrors.kernel.org/fedora/core/updates/6/i386/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.xml.gz                                                  450 kB 00:00 
ftp://ftp.funet.fi/pub/mirrors/ftp.redhat.com/pub/fedora/linux/core/updates/6/i386/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.xml.gz            100% |=========================| 450 kB    00:04     
ftp://thales.memphis.edu/fedora/linux/core/updates/6/i386/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
[...]

Is this observation right?