Pay attention to what he has been doing over his first year - he is making the point that nothing is more important to the Dems than our lack of resistance to invasion and his insistence on protecting the borders/stopping chain migration/lottery migration and other nonsense will result in them crying like babies and refusing to deal.
I will admit my doubt if you are correct. But he said he would sign whatever the group brought him. The group will not send the DACA adults back to Mexico “mostly” nor their parents in the shadows.
And who will they thank? Not Donald. Not the group. But the Dems!