It is correct. There's SO MUCH weirdness surrounding the double slit.

https://en.wikipedia.org/wiki/Double-slit_experiment#Variati...

Hm, it says the observer-at-the-slit experiment hasn't been performed because it would absorb the photons. But it also says the experiment can be done with larger particles, so that shouldn't be a problem ...

I believe I first read about it in the book, Gödel, Escher, Bach.