Did the Three Gorges Dam shift the North Pole by 2 cm?

Numerous sources repeat that, apart from slowing down the rotation of the globe, the Three Gorges Dam caused the geographic pole to shift by 2 cm. For example: https://blog.prv-engineering.co.uk/engineering-three-gorges-dam/
"The secret behind this phenomenon is called inertia and occurs as a result of Newton’s First Law Of Motion. According to NASA scientist, a shift in mass that size does affect the Earth. Raising 42 billion tons of water 180 meters above sea level increases the Earth’s moment of inertia which slows its rotation. It increases the length of a day by 0.06 microseconds while shifting the pole position by about 2 cm (0.8 inch).
I’m curious, how did they calculated above mentioned "2cm"?,