I just recently posted that I was glad that, for the time being, I could use slackpkg for security updates using Slackware.
I read that people do this.
I looked on Slackware's site, the security advisories. I used
I paid close attention. I did not see it update security, like what I've read you can do with it. All it did (that I could see, and I really did pay attention) is update to the newest packages. It was just updating the program versions. I didn't see any updates that weren't a different version than what I had, because it was just the version being updated, not security updates to the version I had. I also didn't see any downloads other than the version updates, that would be security updates for the new versions, either.