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Where are you getting your numbers from?
CFR from: https://www.worldometers.info/coronavirus/coronavirus-death-rate/
The 120k deaths of the winter figure has been put out there by the scientists (requested by Vallance) at various points: https://www.bbc.co.uk/news/health-53392148
The various projections (https://www.bbc.co.uk/news/uk-54756950) vary massively though (which shows how hard this shit is to deal with). But many of those show 60 consecutive days above 2,000 deaths/day, that gives you 120k deaths right there.
Greenbank-
CFR from: https://www.worldometers.info/coronavirus/coronavirus-death-rate/
I can't find 0.25% CFR on there - the nearest is the 0.28% population fatality rate for NYC, which is a very different thing. The other numbers are all an order of magnitude larger, which predicts, thankfully, a much smaller proportion will be infected.
(also, presumably those projections have their own predictions about numbers of cases. I'm not sure why you've resorted to multiplying random numbers together)
grams
Where are you getting your numbers from?
I'd say it's impractical for the virus to spread to 48 million people in a short period time. The virus isn't that contagious and many/most people are doing a half-decent job staying away from others, so its growth rate will slow down long before it reaches a majority of the population.