Some back of the envelope calculations....
Average publishers there in 2019 was about 29,000.
As a rough estimate, over a large population, you'd expect about 1% mortality, so 290 per year, or about 25 per month.
COVID-19 has been there roughly 2 months.
Over 2 months, in a normal year, you'd expect about 50 JWs in the country to die from old age, accidents, other disease, etc. And 87 have died from COVID-19 alone.
Some of the JWs who died from COVID-19 in those 2 months may have died in that same time frame from other causes, but certainly not all of them.
So the conclusion seems to be that COVID-19 has likely at least doubled JW mortality over the past 2 months.