Big comment from Kavanaugh just now: "I tend to agree with you" that the case is "very straightforward" under our severability precedents. Those precedents (including an opinion authored by Kavanaugh last term) say there is usually a strong presumption in favor of severability.
— SCOTUSblog (@SCOTUSblog) November 10, 2020
Under this question, assuming that Texas et al have standing to sue, the limit of the change in the law is ripping out about a page and nothing else. It would be a constitutional and legal nothingburger as standard severability doctrine is that if the Court finds something unconstitutional, it only carves out the smallest chunk of the law needed to bring the law back into compliance with the constitution and make the operation of the law non-banana-pants crazy.