Mann refers to an app called "Halide mk 2" [1]. That's an interesting choice of brand name. It matches the language used by some camera processing software [2]. Of course, it's not limited to image processing, just happens to be used there. As best I can tell this is just a funny coincidence.
It's kind of amusing to a chemist, since in "silver halide" the silver is the interesting part, table salt is a halide as well.
Makes sense though, because if you're a photographer it's the only use of the word "halide" you're ever likely to see, and "silver" is the unevocative part of the name.
[1] https://halide.cam/
[2] https://halide-lang.org/