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Unless I'm mistaken, Thunderbolt is fiber optic; if it's fiber optic, it shouldn't be generating any EM or RF interference.

While optical Thunderbolt cables do exist, they are a niche product. Most Thunderbolt cables in existence is comprised of good old metal wires.

Ah. I was mistaken -- I thought that TB3 requires fiber cables, while USB-C allows for copper.

Thunderbolt uses usb-c connectors, definitely copper not fiber.