Unsurprisingly, the articles mentions that high-class brothels are still doing pretty well. It is below on the social ladder that economic conditions are felt more harshly. The article also mentions that there may be an increase in supply: more women turning to prostitution as economic conditions worsen. And, higher supply means lower prices in a more competitive market.
What the article does not mention is that beside the "nice" legal German prostitution, there is a darker side to this trade: it is that of sexual slavery and trafficking which is flourishing in general but as more women get desperate in already poorer countries in Eastern Europe, the chances of trafficking increasing are great. It is already dreadful economic conditions that have pushed a lot of women from Moldova and other former communist countries into sex trafficking. And anyone who has read Kevin Bales’s books on slavery knows that any category of people that becomes destitute becomes a prime target for slavery.
So, I guess the point of the article was more "it’s tough for everyone" kind but it ignores a significant aspect of economic recession that is germane to its topic.