GDP isn’t national wealth. It just measures economic activity. More people spending money, paying rent and using services can push GDP up without making the average person any richer.
That matters especially in Western countries with our crazy immigration numbers. If you keep adding service and goods consumers, total GDP can grow almost by default. But if GDP per head, wages, housing, infrastructure and public services aren’t keeping up, which they aren't, then people can still be getting poorer in real terms.
Wealth is what a nation actually owns and has built: productive assets, infrastructure, capital, resources and accumulated prosperity. More money changing hands isn’t the same thing.