This is fear-mongering based on incomplete information
According to data from the city register of residents, 51.2% of the population had an immigrant background as of 2015. For the first time a majority of the city residents had a non-German background.[27] Moreover, three of four children in the city under the age of six had immigrant backgrounds.[28] Moreover, about 27.7% of residents had a foreign citizenship.[29]
The city is considered a multicultural city because it is home to people of 180 nationalities. The city contains sizable immigrant populations from Turkey, Croatia, Italy, Poland, Romania, Serbia, Bulgaria, Greece, Macedonia, Russia, Lebanon, Afghanistan, Bosnia and Herzegovina, Spain, Portugal, France, China, Japan, the United States, Austria, the United Kingdom, Pakistan, Morocco and India.[citation needed] The Frankfurt urban area is also home to the second-largest Korean community in Europe, and to Germany's largest Sri Lankan Tamil community
The VAST majority of the immigrants are OTHER "white" europeans.
Frankfurt is the hub of European banking and is competing to grab business from London (doing it quite well)
Germany is an immigrant country.