When alleged domain angels threaten blog hosts with a lawyer, there's usually a sorehead behind it. In this case, it's probably a bird unknown to me so far, but who has apparently already been noticed before - and this time wants to get at Lanu (from DotComTod and BooCompany) presumably because of their postings about him - and, due to the lack of an imprint, now thinks he can force Dirk Olbertz (the one from blogger.de) to disclose the data.
It will certainly be exciting to see what happens next - another attempt to suppress opinions with a lawyer. Whether the noise spreading through the blogs will improve his already spoiled reputation of the domain grabber again is rather questionable.
But when you then see that a legal counsel is also involved, nothing surprises you anymore.