Nope, this is what Packages.bz2 shows for Debian 6:

  Package: vim
  ...
  Version: 2:7.2.445+hg~cb94c42c0e1a-1
  ...
  Filename: pool/main/v/vim/vim_7.2.445+hg~cb94c42c0e1a-1_i386.deb

And the file is still available here: http://debian.ipacct.com/debian/pool/main/v/vim/vim_7.2.445+...

Edit: and no, it wouldn't be available to Debian Squeeze users, since it is served as an update to Wheezy users and not as a separate package (even if it was, it would have been made available only to Wheezy).