Also, featuring the price of his liquor bottles (prominent in the first article about this by the same writer) is indicative of the level of pettiness involved. Maybe there's an actual story here, but this isn't it, and it's not clear that the story is more than "someone said something regrettable on Twitter".
https://en.wikipedia.org/wiki/Will_no_one_rid_me_of_this_tur...
Stochastic terrorism
Probably receiving death threats causes a lot of real anxiety (not just the PC snowflake kind). That's a lot better than an actual assassination, but it's not nothing either.
People often say things just to express themselves rather than for any planned and considered reason.
I greatly doubt the plan was to cause harassment. The gains are extremely low and this could cost him his job.