Did they count only office workers? I bet way more people die in cobalt mines in Africa to make our electric car revolution affordable.
If there's a good source on cobalt mine deaths that shines a light on the issue why not consider submitting it to HN?
I imagine a similar phenomenon exists for other mineral resources.
On the other hand, the answer to GP's question is that this study isn't predominantly about officework. It's a global study[2], and miners are likely accounted for. Americans account for less than 5% of the statistic.
[1] https://www.theworldcounts.com/challenges/planet-earth/minin...
[2] https://ars.els-cdn.com/content/image/1-s2.0-S01604120210022...