This is not true, I don't think people realise how much the renewable prices are currently dropping: https://www.theguardian.com/environment/nils-pratley-on-fina...
I can see the benefit of fusion though I'm not very convinced by the density argument (we do have space to put solar on our roofs, wind on our shores, batteries in our basements and distribution points, and plenty of spots to pump geothermal)
I'm not seeing any Solar Panels or Wind Turbines on the market that can output 80 TJ per Kilogram of Weight over their lifetime.
The article you linked talks about Energy Cost, which is another issue. Though considering Hydrogen and Helium are the most abundant resources in the universe, I'm not holding my breath for any renewable resources consistently beating that.
Cost =/= Density, otherwise we'd be powering electric cars with AAA batteries.
>(we do have space to put solar on our roofs, wind on our shores, batteries in our basements and distribution points, and plenty of spots to pump geothermal)
Yes but the point is that fusion requires a lot less space for a lot more power, doesn't depend on the weather or surrounding geology and is 100% clean.
Uranium is somewhat difficult to obtain; you have to mine it from deep under (using what amounts to slave labor), clean the ore and then carefully and thoroughly enrich it (238 is almost unusuable in reactors, you need 235, which is only present in a small fraction of the ore).
On the other hand, getting hydrogen can be achieved with electrolysis (electrolysis requires less energy than the fusion reaction produces), various other chemical processes or simply solar wind.
Hydrogen is the most common material in the universe, it will and can outpace any other energy source.
Renewables are simply different methods for capturing energy from the fusion happening in the sun with some efficiency.
Fission already beats renewable by a good margin and Fusion puts some on top of that.
The fuel for fusion is incredibly cheap; hydrogen and helium, the most common elements in the universe. Easily obtained from solar wind if we find the amount on earth is lacking.
Additionally, Fusion does not produce any dangerous waste. Any byproducts that are radioactive decay quickly.
Fusion is also a lot safer than Fission since the reaction cannot exist outside reactor conditions while a uranium rod will happily go prompt critical if it gets the chance.
Fusion is cheap energy.