Hmmm... I'm thinking it depends on the aggressiveness of the ionisation source and quality of vacuum of their mass spec, lots of molecular ion fragments could weigh 292.
I'm reminded of a story of a fly in a mass spec.
Lets see it duplicated on another instrument first.
Wait, I RTFA and it seems they were using ICP-MS, aggressive, but not high vacuum. Skimmer cones in ICP MS can introduce all kinds of issues. (Nature of the beast with an atmospheric ionisation source). I'd like to see it duplicated perhaps with a laser ablation TOF instrument.