Denmark has been the most systematic about collecting this sort of data about immigrants from different places. I suspect you’d see similar results in the UK and Canada if those governments collected the data. Canada’s GDP per capita has actually started declining recently.
I think Denmark’s welfare system is a model, so whoever you’re arguing with, it’s not me. I will point out that, if Denmark with its robust welfare system can’t integrate MENAPT immigrants effectively, that doesn’t bode well for other countries with less efficient welfare states.
Net cost to a national government and GDP per capita are not the same thing. Presumably these people become more productive by moving to more developed countries; that's the general reason that people immigrate to particular places. My impression without looking at the data is that US GDP per capita has continued to increase despite large (called a crisis by Republicans) numbers of immigrants during the Biden Administration. And given that these people are not citizens of the US, presumably they will not be eligible for all benefits granted to citizens which would decrease their cost to the government.
What is MENAPT here?
Middle East, northern africa, pakistan
…and Turkey, the T in MENAPT.