The rule of law is not at all political. It's philosophical. It's a shame you see it otherwise. I see it as a marker of how far we've fallen. We can no longer discuss something as "the rule of law" without people claiming we're discussing politics.
This presume that we were once at a level where the rule of law actually existed. Humanity across the world and across the ages has never been in a place where there was equality of all under the law.
What it means in the real world is entirely political. There is much open to interpretation, by the political system.
And in any case this article isn’t about the theory, it’s a complaint about a politician. This article is 100% political and clearly doesn’t belong here.