In Chapter 13 of the book, we have a description of the mechanism causing the Chandler wobble of the Earth’s polar axis. Last fall, NASA updated a description of their understanding of the axis drift  described here, which we can place in context with the model …
Data for the Chandler wobble is located here. Taking the first derivative of the Y position (which also removes the drift component), we can plot the data and fit the lunisolar declination forcing model to that data.
In the future, we can continue to track the Chandler wobble and observe if it continues that predicted by a lunisolar forcing.