As the sides slope at 1 degree as it rises, it is going to take a structural survey with precise equipment to confirm any tilt — a photographic survey won’t provide any true indication.
They renovated it recently and surveyed all the stuctural in-place characteristics.
When it was being finished in the late 1800s after the civil war lull in construction, the workers topping it out were shaken by an earlier earthquake that was felt from there to Ohio.