@Nihil
Unfortunately, that's not true. I invite you to look up "Science and Futurism with Isaac Arthur" for a better explanation but the simple form is, each shell of a Dyson swarm will absorb the energy coming off the star it surrounds, but it won't make it go completely away, instead radiating it away at a lower frequency. The same way a black object in the sun won't pass, or reflect, much light, but will become warm to the touch. The result is, any star with a Dyson swarm around it should glow like a banked fire in the infrared.
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@Nihil
Unfortunately, that's not true. I invite you to look up "Science and Futurism with Isaac Arthur" for a better explanation but the simple form is, each shell of a Dyson swarm will absorb the energy coming off the star it surrounds, but it won't make it go completely away, instead radiating it away at a lower frequency. The same way a black object in the sun won't pass, or reflect, much light, but will become warm to the touch. The result is, any star with a Dyson swarm around it should glow like a banked fire in the infrared.