There a quite a few reputed scientists mentioned in the article that have examined the results. I am quite sure somebody would have detected a scam if it were one, also considering this is an unusual claim.
Notice how the "reputed scientists" weren't invited to evaluate the device scientifically. Instead, they were invited to attend for a day or two, and write a report on what they saw.
These prototypes were producing milliwatts
of power over a day or two. That's tiny! Notice how the construction depends on an anode, a cathode and an electrolyte? Notice how the construction includes nickel and manganese, typical components of a battery
Like all these so-called "energy breakthroughs" where the owners do not permit serious scientific investigation, there's nothing going on beyond regular chemical energy.
If the developers really had what they claim, they would allow someone to test it for long enough to rule out chemical energy as the source.