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I can assure you mass immigration is not good for the working class families of this country despite what an economist might say in aggregate. The reality is more people drives up the costs of food, shelter, medicine, and other resources that are not very elastic.
Don’t overthink it.
This claim is contrary to all common sense. When stores sell lots of certain products, they order more and run sales to attract more customers, they don't raise prices. The supply shocks with eggs and inflation of food prices were driven by disease, war and the opportunism of monopolistic agricultural industries, not because people are buying too much food. Outside of cities, where housing development is usually a political/legal zoning issue, houses are expensive because they've become assets and investments rather than places to live. Apartments are also increasingly monopolized by national and multinational corporations. Housing prices are linked to the population density, but most of the inflation in prices is driven by other factors. There's more than enough housing and space to build housing. Artificial scarcity won't go away by deporting a few people. Some brand name medicines are certainly subject to supply and demand, but I highly doubt immigrants are having a large influence on prices.
In general it does - new housing, job creation, all of it.
What you’re really seeing is when something - often policy - gets in the way and a place ends up underbuilt.
It’s still a problem but it’s one with different solutions.
Especially when the real numbers of immigrants is much higher.
It takes time to train more doctors, to raise more cattle, and to build more homes. Way more than the rate of immigration over the last 30 years.
It makes rich families richer though. But it hasn’t been good for working people and the community culture the country once had.