They probably meant reiterate

I’m being pedantic, but if you know you’re a carrier (and don’t know the carrier status of your sister) then it is 1 in 8

It looks like ChromeOS is reported separately in those stats

Nah, you buy petrol in litres, but mileage is calculated in miles per gallon. Which is much worse

You can just turn it off. It is the ‘offline updates’ setting in the updater settings.