The head of the Australian energy market operator AEMO, Daniel Westerman, has rejected nuclear power as a way to replace Australia’s ageing coal-fired power stations, arguing that it is too slow and too expensive. In addition, baseload power sources are not competitive in a grid dominated by wind and solar energy anyway.
How did you get that conclusion from the article you linked? The article talks about a material that can recover 6.63 mg/g per week of uranium from seawater, so a ton of it would produce just over 10lbs/week. If you produce a large enough amount of that material and put it to work it will add up to a useful amount of uranium in a short amount of time.