so who does Bloomberg speak for? From the perspective of transnational corporations, illegal immigration is indeed a giant stimulus program.

It imports a pool of super-cheap labor that can be absolutely exploited, because the employers can (and regularly do!) call the police on them if they resist their exploitation in any way. This drives down wages for the rest of the work force, who have to compete with people who are not on the same legal footing as they are. As a bonus, you get a political talking point out of it. Conservatives love illegal immigration, because they get to publicly hate it. Witness the US Congress refusing to pass a spending bill that has money for the border crisis in it - they're protecting an election topic they can rile people up with. Conservatives are not the solution here, they profit from this, on multiple levels, in PR as well as in support for/from their friends in high business. (nobody here is on your side.)

The other side of this is the instigation of forever wars, which are of course not exclusively meant to drive immigration to imperialist countries, but do ALSO have that effect, which serves the transnational enterprise class quite well and is one more reason for them to support these wars. None of this, of course, is the fault of the immigrants. They're getting their lives destroyed and then squeezed (as well).