A curious incident of the iPhones in the hospital: A post in r/sysadmin by a hospital IT admin tells a strange story: devices in his hospital either died completely or lost important functions on the same day. Oddly, all these electronics had only one thing in common: they were all Apple products.
https://www.notebookcheck.net/Reddit-post-claims-that-an-MRI-machine-killed-all-the-Apple-devices-in-the-same-hospital.354531.0.html
So helium could kill Apple devices? Interesting lesson!
Just temporarily. A week later or less, the helium has leaked out again and the device will work again.
It's not like people are exposed to high amounts of helium in a daily basis.