Yes, but this did not discontinue common usage of the nobility prefix "von" [occasionally "zu"] denoting nobility in the family lineage at some point in time. Look at a historic atlas of Germany before unification was achieved under Bismark. The area we now know as Germany was as late as the end of the 19th century comprised of dozens of separate countries (e.g. Prussia, Saxony, Palatinate, Saxe-Coberg, Bavaria, Hanover, Westphalia, etc). Each had its share of noble families using the von prefix. And many families lost their official titles due to various reasons but continued to use the nobility prefix. It is estimated that at the time the Weimar Republic abolished nobility, as many as three hundred family names outside the official nobility were using "von." Perhaps this fella actually is from a family that was still officially of the nobility class when nobility was officially banned, and he uses the title "prince" to differentiate himself from the "pretender" families using von in their name then and now.
