Since May 13 2011 until now, -current has had 728 packages rebuilt, upgraded or added. 435 of those have been within the last 2 months.
My source? http://ftp.uninett.no/linux/slackware/slackware64-current/ChangeLog.txt (a decent mirror if you are looking for one)
The link you provide is equally uninformed since it stated,
"Slackware does not have an apt-get (Ubuntu), portage (Gentoo), or some other variant to allow automatic pulling from an approved repository. Instead, you browse and download .tgz listings and run their pkgtool utility."
Yet it does have such a tool. It is called slackpkg and it is included in the default install. In many ways works slackpkg works just like apt, other than not automatically dealing with dependencies.
When the next release does come out (and it will) perhaps would you care to post back here to admit your mistake. Since I'm guessing it would be a little hard for you to swallow your pride and do it right away