Yes, although technically that's not the mirror, the true mirror is at http://dl.atrpms.net/mirrors/fedoralegacy/ including yum20 format headers. I wouldn't start changing content in a mirrored part :=) The problem is that yum-arch has a bug that breaks my yum20 repos: https://lists.dulug.duke.edu/pipermail/yum/2005-July/007140.html yum's author will probably recommend to upgrade yum, if you rereport this bug, and I would agree, as there have been tons of bugs fixed since fc2 time.
Ok, thanks. I guess I don't really have any reason now not to upgrade, since Legacy is now including the new repo format in the older distro directories.