Dr. Woit's blog is directed towards physicists, for the most part. This sort of thing is covered very early on in a graduate education in physics; it's old hat for that crew, but incomprehensible to anybody else!
https://www.math.columbia.edu/~woit/wordpress/?p=10533
It’s interesting the reply from John Baez (another mathematical physicist) to Woit’s “The state of the world is described at a fixed time by a state vector, which evolves unitarily by the Schrodinger equation. No probability here.”:
“And perhaps no physics here, either, unless we say how the state of the world is described by that vector: that is, how we can use the vector to make predictions of experimental results.”
Just to elucidate the general principle a bit: sometimes a reminder or different perspective of past learning using vocabulary you already know can be valuable. Humans aren't perfect decoding and recall machines. And that's assuming the author and target audience learned the advanced vocabulary in the exact same way, which is unlikely. Sometimes you need to fill in gaps in some of your audience's knowledge, perhaps that they should have learned but didn't, maybe because they or their teacher was having a rough day in class.