It's directionally correct though, no? What's the case to be made that Germany is ascending? The fact that most German billionaires inherited their wealth is pretty telling I think.
It shows that inheritance tax in Germany is too low and that unfortunately there is no longer a wealth tax.
Or just hike the capital gains tax. Those billions of dollars have to be put somewhere, and the ultra-rich aren't going to hide it under the mattress. Inheritance tax is fairly easy to avoid with sophisticated tax planning.