Jim, I'm sure both you and I are familiar with gold-flashed 0.1" pitch PCB edge-connectors, and platinum or phosphor-bronze coated jack-pin plating and switch-contacts coating (all to present corrosion-free smooth mate:make:break low-resistance connections).
However, the video author specifically cites the use of ruthenium plating on eg high-end 3.5mm 1/8th inch & quarter-inch audio jacks. I'm going to doubt this, for the reason you state (ie reactivity with water) but also, why on earth would it be used as a facing plate coating if there are concerns about it being a potential carcinogen?
I suspect both you and I will have been exposed over the decades to somewhat more than the median exposure for lead:tin alloys (solder), mercury and mercuric compounds (wetted switches/relays), beryllium (heatsinks), germanium/silicon (transistors/gates/diodes/all semiconductors), all in addition to a background 'soup' of polychlorinates/potting resins/flux-paste/lubricants etc.
(And in my case, originally, also wet lab chemical reagents and biochemical/microbial elements....and, for both of us at one time I'm sure, plenty of exposure to stong local fields of radiofrequency non-ionizing radiation).
I occasionally ponder about Sheldon's claim that he was "just one lab accident short of becoming a superhero". I'm going to guess
@Jim that you and I passed that point maybe quarter of a century ago.
So what's your superpower? I doubt whether the liminal chemotherapy/radiotherapy that I've been exposed to for over half a century has actually done me any actual
good....but it would be nice to fantasise that this, somehow, was the case.
EDIT
I forgot all the radioactive sources I've handled....various high-count Uranium and Americium samples. Oh, also tritium / similar dials and vials