I'd really love it if you repeated the same tests for Bing, just to get coverage. (Yahoo/Baidu would be the other big two.) Historically, Bing hasn't used fully functional headless browsers to crawl, which has limited its ability to index dynamic content like this.
Google has "only" 70% market share, so it seems irresponsible to make engineering decisions without testing the others. Google+Bing+Yahoo+Baidu get you to 98%.
I just did this page. The page is indexed. When I look for the search term "Update this was posted to Google on Friday the 17th of July, 2015. Monday, the 20th" the page is shown.
Trying to find any of the other search strings in the article for the different loading variants does not return any results. So no variant of javascript injected content is working on Bing currently.
"Originally, none of the actual web crawling and data housing was done by Yahoo! itself. In 2001, the searchable index was powered by Inktomi and later was powered by Google until 2004, when Yahoo! Search became independent. On July 29, 2009, Microsoft and Yahoo! announced a deal in which Bing would henceforth power Yahoo! Search."
Google has "only" 70% market share, so it seems irresponsible to make engineering decisions without testing the others. Google+Bing+Yahoo+Baidu get you to 98%.