For the centroid that make the node here (geopanda with lambert 72 conversion) : https://www.openstreetmap.org/search?query=50.85381161651116%204.369368058785593%20#map=19/50.853812/4.369368&layers=N 

That's the less interpreative way to put the center, that's don't hurt me for many municipality in the region except Brussels City

In oder hand if someone ask me where is St-Josse center is :  i probably instinctively respond on the pin.

So i am 50/50 but definitivly not where it's put actualy.