Worth watching about Helion:
We know we can achieve fusion, but as far as I'm informed we still don't know that we can take more energy out than we put in.
> On December 13, 2022, the United States Department of Energy announced that NIF had exceeded the previously elusive Q ≥ 1 milestone on December 5, 2022. This was achieved by producing 3.15 MJ after delivering 2.05 MJ to the target, for an equivalent Q of 1.54.
Improbable Matters video is.. OK. He raises some valid concerns. I think he was genuinely trying to understand and critisize the technology honostly. Though it seems he misunderstands some key facts. I've never seen that kind of honesty with Thunderf00t.
From what I can gather a lot of Improbable Matter's critisism is based on misunderstandings or flawed understanding of Helion's specific approach. But yes, it's a good watch if you don't blindly trust his conclusions.