The Short Version
Mostly True. The double-slit experiment does demonstrate that performing a which-path measurement eliminates the interference pattern, a finding confirmed by peer-reviewed research and a 2025 MIT experiment showing a quantitative tradeoff between path information and interference visibility. However, the claim's use of "observation" is imprecise — the operative mechanism is physical measurement and information acquisition (decoherence), not conscious awareness. This ambiguity can foster the common misconception that human consciousness collapses quantum states.