Physics PhD here. You're correct. Any measurement of the electron state will affect the state. Grandparent did an excellent job setting up the hypothetical sce

Physics PhD here. You're correct. Any measurement of the electron state will affect the state. Grandparent did an excellent job setting up the hypothetical scenario by the way. It just turns out QM is awesomely weird like that. It does mean a mass which was de-localized by miles can, theoretically, localize to a single point instantly. However, any information about that localization is restricted to moving at the speed of light.