Oops! I was looking at the fuel burning bit on the link. However, for the treatment of water, there is quite a lot of evidence that the magnets do change the structure of the calcium ions in the water to a type that do not cause hard precipitation.
In about 1985 there was a report in New Scientist about the then new-fangled water conditioners, and Vauxhall had installed big ones in their paint plant in Luton. They not only cut the rate of deposition of limescale, but they caused the deposits already there to go into solution.
I have no contradicting information about this, and I'm reasonably comfortable they do have a useful effect on water. But I don't believe it's any better to drink than any other water, it just doesn't scale pipes up so much.
Sorry if this has caused any confusion.
ooh, er.......I've just read the Ecoflow information on their site, they distribute their products by "network marketing", now I seem to remember that's a euphemism for some some selling method that I can't quite put a name to........wonder what it could be?