I've never heard of anything that fast either. I think that is one of the reasons Dog Gone was skeptical.
Remember, the evidence is anecdotal. Assuming the report is based on an actual event, it still does not mean the person died from something he caught while slaughtering a pig.
What I'm wondering is if this was a one-time event, or whether these people had been continually slaughtering pigs over a period of days. If so, couldn't it be that they were infected while slaughtering an earlier pig and symptoms began appearing only after they finished the last pig?