Why does my Antix-23 install have a systemd apt job running under cron?

I booted AntiX this morning, selected software updater and was told that I couldn't update because apt was already running. So I tried "ps aux" and sure enough, there was a systemd/apt thing running as a cron job. A few minutes later, it was gone and I was able to do my update.

What's going on? I thought AntiX didn't use any part of systemd.