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If they can make it work with a few tens of meters of head then it makes much more sense.
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I need to dig up a paper i saw a few years back for a small private water power system near a stream, but it used a constant gravity feed vs an impulse feed.
Very compact and virtually no loss of potential energy on the way down ( unlike the big turbines ) but not sure how scalable ( or durable ) it would be in large scale, as i assume mechanical losses would go up accordingly.
( Think of it like a string of buckets on a looped rope that goes vertically the whole way from top to bottom. The weighted buckets on the rope always provide a constant torque supply so designing the turbine can be matched to suit.
Andrew