How does he do it?

[freebeard]

Amazing! How to Make a Water Pump That Works WITHOUT Electricity or Fuel

The only real question is how does he fake it. I propose a sump pump in the river.

[Logic]

IMHO the only way a magnetic field can pump water is MHD where electrodes produce + and - ions that are affected by a MF.

https://www.youtube.com/watch?v=WgAIPOSc4TA&t=89s

There does seem to be another way to pump water without using electricity by using the Hydraulic Ram Pump effect.