I added some pictures for you. At first glance, I would have thought that to be a pretty bad post. All wood is not created equal, and it appears that you have a well treated post, assuming the retention rate is up to snuff, and there really is that much heartwood in there. If that were southern yellow pine, it’d be a five year post at best.
The pic with the last paragraph outlined in red should be of particular interest. You are entitled to test results.