The fusion reaction itself is easy to cause just in a simple desktop experiment. So, the fuel is deuterium, that is, heavy hydrogen, that is, hydrogen with an extra neutron in the nucleus. So, use deuterium instead of hydrogen to make water and get heavy water. Then have a target with some deuterium and an accelerator and shoot some deuterium at the target. Presto: A fusion reaction as described in the article.
Easy? Yes. Practical? No! The reaction rate is tiny. Likely nearly all of the deuterium shot at the target causes no reaction and, thus, has the energy used to accelerate the deuterium wasted.
New? No. This has been understood for decades.
Generate a chain reaction? Nope.
Destroy the planet? Not a chance!