He's "politicizing" nothing. He told the Administration to reform the order to address what's wrong with it. The Administration is proceeding to do so. That's the system (and yes, justice) working, protecting both the President's right to unwind a previous President's EO, as well as the interests of those who are, legally speaking, stuck way out on a limb.
Granted, every other damn fool under the sun is politicizing it.
Roberts spelled "penalty" T A X and upheld one of the most disastrous crap bits of legislation, ever, costing millions of Americans any health insurancethey had.
Recently he rewrote "sex" (as used, the obvious original intent of the legislation being a "binary" biological determination of male versus female) into an act, a preference, an "identification", a practice, in order to encompass the right of perverts and sick people to a job anywhere.
Someone has some career ending dirt on him, and something that could possible put him in prison, and they are pulling his strings. Either that or anything conservative he ever did was just an act.