i presume he doesn't want to be the one to out the guy, which might be viewed negatively. instead, he gave just enough details to let someone else to do the outing.
I surmise that the interest in this post (both the retweets that brought it to my attention as well as the upvotes that propelled it to the top of the front page almost immediately after I submitted it) is largely driven by an expectation that the investor described in the article would be outed.
It's been noted by you and others elsewhere in the thread, but a reading through that lens leaves the impression that the details provided were intended to have exactly that effect.
