The complexity of Sysvinit is orders of magnitude less than that of systemd.
If I extend the search to all packages built from the "sysvinit" source (which includes packages like initscripts and sysvinit-utils), the count increases to 8. (source: https://www.debian.org/Bugs. I'm not linking to exact queries since they take quite some time and HN has a tendency of taking down Debian's bug tracker)
That's literally the definition of replacement.
So you're correct, in a way.