I’d bet they’re pretty much on the mark, sadly those illegals will hurt a lot of people too.
About the only temporary fix I can think of is to set up Joe Arpaio-style tent cities, using the real rationale that otherwise it will turn into a humanitarian crisis.
The trouble with that is that inertia would end up with them living them for years, so whatever real fix exists, it would have to happen quickly.
For a time, AZ had an effective solution: self deportation, of flying them to Mexico City on jumbo jets. It’s about a thousand miles from DF to the US border.
In this case, sorted by nation of origin, president Trump could offer to restore these nations foreign aid if they agree to take their people back.