It isn't really. It's just the standard partisan split, albeit with one guy "crossing the floor". Such crossing is common but since most of the media is incapable of understanding anything but partisan point scoring, they portray the Justices as partisan hacks, which they are not.
Heck, they aren't even that good at tracking point-scores, since the most common score at SC United (states) is 9-0.
https://en.wikipedia.org/wiki/2018_term_opinions_of_the_Supr...