I used the way back machine and went to the time that the Plural Marriage in Kirtland and Nauvoo essay was first posted on the lds site. The first posting was October 22 2014. I only took the first section and compared it to whats on there now. They are the exact same. Granted, this was just done for one part of one essay, but it seems nothing is changed. Yet.
Here is the link to the first time this article was on the web.
Using your referenced original posting against the current version in Microsoft Word document comparison indicated no changes to the Nauvoo Polygamy essay.