Maybe the problem is because they are looking into Wikipedia, but they should be looking into Corrosionpedia!

https://www.corrosionpedia.com/definition/1657/sacrificial-a...

The Corrosion Doctors are also on it... :-)

It takes 60 tons of paint and needs to be done by hand. The solution for Cathodic protection would have to be, it seems, by covering it in Zinc before the repaint.

https://www.corrosion-doctors.org/Landmarks/Eiffel.htm

I'm sure all the engineers who worked on the Eiffel Tower in the last 100 years nobody has thought of that. You should call them up.

I don't think that works on something like a tower. When they use them on ships they change the voltage of the hull relative to the water but the tower doesn't have a continuous body of water to make a circuit.