That is a significant development in Roman's case. It must be encouraging to know that Mixing itself has been explicitly acknowledged as legal through that judicial opinion.
This is a crucial development for all Bitcoin users who rely on the challenges of financial privacy afforded by cryptocurrency technology. Nevertheless, it's good news by any means prosecution would however thus probably not care and choose to select cases on whom they put pressure upon anytime something official wasn't fitting well towards their aims.
The wrongful accusation of operating Bitcoin Fog still stands, although with this development making its mark understood in future cases, perhaps there will finally be room for more customized application regarding regulatory finesse reliance on their expertise at ground zero relating criminal aspects using such relevant techniques and other such precedents quantifiers considering novel applications.