You're talking about the base OS packages, but John meant Swift in comment #22. Only you know where you are obtaining it. AFAIK, CentOS itself does not publish Swift. Most of the time, it comes from RDO. But some people just run pip to get a stable branch (on top of CentOS, yes). In your original report you are aware that you run Swift 2.4.0, so you should also know where that comes from.
You're talking about the base OS packages, but John meant Swift in comment #22. Only you know where you are obtaining it. AFAIK, CentOS itself does not publish Swift. Most of the time, it comes from RDO. But some people just run pip to get a stable branch (on top of CentOS, yes). In your original report you are aware that you run Swift 2.4.0, so you should also know where that comes from.