The problem is that Google's "experiment" didn't include a control group. Is Bing copying Google's results, or just measuring click data?
The trivial addition to their experiment would be to add those nonsense words to a few Wikipedia pages, and click the links with the Bing toolbar installed, and see if those pages show up in the Bing results.
Measuring click data that gets turned into a correlation between the query string and the result on Google's SERP is copying Google's result, because that's the upshot of it - that is its effect, in these rare long-tail searches.
If the toolbar is simply sending "they clicked link X from a page with text 'A B C'" and they are using that in their search engine to mean "If someone searches for A, B, or C, they might be looking for X" then that is, in fact, NOT copying Google's results, it is a general measurement of how users react to ALL web pages.
The trivial addition to their experiment would be to add those nonsense words to a few Wikipedia pages, and click the links with the Bing toolbar installed, and see if those pages show up in the Bing results.