this is complete nonsense of course. the earth's magnetic field is weakening and this is changing the rotation speed, which is speeding up, and the magnetic pole has moved very fast, accelerating, in the last 150 years, most of the distance it has moved now was in the last 20 years

anyway, when you look at what the estimated mass of the earth is, even if we moved ALL of the water around it wouldn't be even 0.001% of the mass and that's not gonna change the rotation of the earth one bit