If you follow that through the series of links, you find that it is just an assumption based on one guy who didn't know the project existed thinking unchanged = unmaintained.
Are you sure? There hasn't been a release for 8 years.
I followed the links a while ago after hitting an intialization failure bug that leaves Linux boxes with the incorrect date. I found that neither Arch Linux or Redhat consider OpenNTPD to be supported on Linux.
It would be good if you could explain what I am missing. If there are more recent Linux releases and the information on the Redhat bug tracker is incorrect I would like to know. I'd rather be running OpenNTPD than ntpd.
I'm sure LibreSSL won't have that problem but I thought it worthwhile pointing out that support for other OSes is not guaranteed.