This is such a wrong idea about immigration and the economy and how it grows that it's almost more funny than sad.
No Western government is growing its economy through sectors primarily staffed with low wage workers. The US, for example has seen much of its growth in the tech sector. And as it's had huge numbers of immigrants to meet the demand caused by tech growth, real wages in that sector have risen for nearly a decade. And they outpace wage growth in many other sectors over that time.
But regardless of that, when an economic sector grows it's able to convert human productivity into returns beyond the pay of those humans. And often that growth allows the return rate over productivity to increase over time, making it more attractive for a business to hire more and raise wages. In such a market, when a population doesn't grow, there needs to be workers from either outside the country or imported in. You can't just have mandated degrowth of growing businesses. That's worse than communism