Kavanaugh votes either way, but I don't think this is out of principle... I just think he's just kind of an idiot and thinks he can write a justification for just about any of his biases without making those biases obvious. It's kind of apparent if you read his opinions; they tend to be very verbose (his dissent here is 63 pages!) without saying a whole lot, and he gets sloppy with citations, selectively citing precedent in some cases while others he simply hand-waves. Take his opinion in Noem v. Vasquez Perdomo (the "Kavanaugh stop" case): there's a reason why no one joined his concurrence.