> is Ellipsis saying that before Covid New York averaged 25 deaths a week
No, in the link I gave, about New York resorting to mass graves, it was talking about the number of burials at one site increasing from 25 a week to 24 a day. Here's the link again:
https://news.sky.com/story/coronavirus-new-york-victims-without-family-buried-in-mass-grave-on-hart-island-11971679
If the typical daily deaths in the UK in years gone by is 1600, the really interesting stat would be "What are the daily deaths now, under lockdown?" Giving we are mostly living safer lives, (working less, travelling less, etc.) you would expect it to go down a bit were it not for Covid-19. The amount it has gone up would be a better indication of the number of deaths caused "by" Covid-19, regardless of "of" or "with", under our lockdown conditions and allowing for lag etc.
New York is an example of how much deaths increase above the typical when Covid-19 is left unchecked for too long. Digging mass graves is definitely unusual.