The good news is the race was added. Unfortunately the announcement is a mere fortnight before the Games.
http://www.dyestat.com/gprofile.php?mgroup_id=44531&do=news&news_id=486340
Some commentary on the decision
Recent Runners World article on race walking by Olympian race walker Maria Michta-Coffey
"Race Walking 101: Two-Time Olympian Schools Us on Her Misunderstood"
What's next/ what can you do?
http://erintaylortalcott.blogspot.com/2017/07/women-racing-50k-in-london-good-bad-and.html