That could have worked as an explanation. But the fact that Palpatine can drain their energy without their approval signals to me that he is using a different version of the same power.
Perhaps Plagueis was capable of draining life from one individual and giving it to another. And Palpatine “perfected” the maneuver during his time on Exegol by figuring out how to drain Force energy into himself.
I get it, this is all speculative mumbo jumbo, but I believe it is the most reasonable explanation for everything seeing as how it brings the whole saga full circle.