I read the article and I fail to see a benign application for this technique except for confirming conspiracy theorists' fears regarding vaccinations and 5G.
>An investigation by Moderna, Rovi and Takeda Pharmaceutical Co., which is in charge of the vaccine’s distribution in Japan, is ongoing. The foreign material is “a metal that reacts to a magnet” and is believed to have entered the vials during the production process, the Asahi Shimbun quoted an unidentified senior health ministry official as saying.