Puff piece. But it's not a complete fabrication.
Practical tidal power has been around for more than half a century. It's a perfectly reasonable energy source if you have a suitable location. See https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2F...
Strong points: It's predicable. It doesn't need appreciable fossil fuel except for initial construction. It can generate respectable amounts of power -- hundreds of megawatts in the best cases. Tidal power facilities pretty much can't blow up and probably won't harm the neighbors if they fail.
Weak points: There can be significant environmental affects. The generating equipment is subject to salt-water corrosion and fouling by marine organisms. (Probably) twice daily times of peak power production will shift by 50 minutes a day. In a few cases, generation may interfere with navigation. While most potential sites will have two tidal peaks a day, one peak can be substantially weaker than the other. The initial costs are high. And mostly, there aren't a lot of good sites with exceptionally high tides. However, the Arafura Sea between Australia and New Guinea is a place with exceptionally high tides. (Others -- The Bristol Channel, Gulf of California, Bay of Fundy,Cook Inlet,Strait of Magellan.)
So as Slashdot's daily dose of enviro-babble goes, tidal power stands out as not being something that a competent editor should reject out or hand. This particular article is a bit short on substance. But it could be a lot worse.