The Great Replacement is a white nationalist far-right conspiracy theory

In the language of political correctness, precisely the same thing is called "super-diversity"

Whereas non-Belgians made up just 6.5% of the Flemish population in 1990, they now account for one-fourth of its inhabitants.

Today, people of more than 180 different nationalities live in Flanders and one in four people in Flanders has a non-Belgian origin. In Brussels, it is even three in four

People with migration backgrounds are fanning out to the outskirts, places that were previously less diverse, including in "smaller towns with an industrial past and outdated working-class housing,

A growing super-diversity goes hand in hand with a poor(er) population and fewer fiscal resources.

Some municipalities also fear a "suction effect" in their municipalities that will see people with migration backgrounds flock to their area, and are apprehensive of a challenging difference in mentality between residents who have lived in the municipality for a very long time and "newcomers."

In response, experts stress that super-diversity is a demographic and social reality that cannot be controlled or stopped.

https://www.brusselstimes.com/belgium/367375/flanders-increasingly-diverse-and-not-just-in-cities