Well, this proves what I and others have been saying lately - negative SEO is real.
Unfortunately it also proves the worst case scenario - Google has lost complete control over the algo, which has become too complicated for them to make any reasonable changes without a myriad of unexpected results. I will once again use my favorite analogy - the "butterfly effect", killing a butterfly in the past changes everything in the future. The same with the current algo - changes that are claimed to affect 0.1% of the websites set this forum on fire because everyone is affected.
In the past few months I have witnessed so much variation of search results, it's not even funny. It shows that Google is tweaking the algo a lot - and the changes are not what they are expecting. It's just basically a patch-work right now, this "tool" yet another attempt to salvage something that should clearly be scraped and redone from the ground up.
Not to mention that my suspicions are that this "tool" is just a placebo for the webmasters. It will simply give you the fake belief that you have some form of control and that you have a tool to fight this type of negative SEO. Of course it's not going to have a real effect at all. Are you that gullible to believe that Google would give you a way to manipulate the algo?!? Really? Did you just crawl from under a rock? You expect that Google will give you a real tool to let you "pick and choose" which links the algo uses for evaluating your website? Yeah, right! Good luck with that pipe dream...