For Charge Date estimates, it actually does!
And it does it very precisely, using the exact numbers of applications from the spreadsheet.
CIC has been charging fees with a surprisingly constant pace on average since the start of FSWP 2014 - it's very clear when looking at the existing data closely.
So far the estimates made 2.5 months ago have been true +- a week, and they've been improved since that time to be even more precise.
Sorry if this sounds too logical, but there's no much room for earlier charge dates, unless CIC really does something to improve their speed.
Good thing, it's unlikely for the real charge date to be later than the "last charge date" indicated in the estimate.