Except that the bill ensures the status quo of continued taxpayer subsidies for the employees of the businesses employing illegals, in fact, it writes such subsidies into law.
Except that no "bill" can do any such thing. The status quo that's passed today can be quietly amended and reversed as an amendment to some other bill next session.
The author proposes that the biz-owners are rammin this through precisely because the status quo is about to change and, according to the author, they want this passed to protect them from the next Prez and Congress which will sweep away all the pro-amnesty congresscritters.
Thus if the author is correct, and their pro-amnesty protectors are swept out of congress, then the big-biz pro-illegals will be even MORE vulnerable in the next congress because their protectors will be gone, and Hillary is going to find a way to crush their balls no matter what legislation is passed this session.
The supporters of amnesty can be wrong, and also believe that it's the right thing to do at the same time.
The pro-amnesty people may just simply believe that what they are doing is the best compromise they can get before Hillary gets in and they have no say, and that doing nothing is worse.
The author's explanation here for their motivation falls short.