I'm generally a very satisfied user of EF, but this seems a little disingenuous -- are you denying that the predicted "back up" time displayed changed a couple of times during the downtime? I'm pretty sure that it did.
It also seems a little naughty to describe the downtime as "scheduled", which is what the "we're down" page claimed.
Of course people can understand occasional downtime, but if it's planned ("scheduled") then it would be easy enough to send out a quick mail in advance. Making the service unavailable on a Saturday morning (US) is never going to be popular, warning us in advance would have enable many people to plan their system use around the downtime.
I don't see where EFV denied anything in his response. You are correct that the notice on the site changed more than once as to what they thought would be the time the service would be restored. Having done support on my own company's servers, you make a good faith estimate as to how long things will take before you start the process. In this case of EF, the process was not entirely under their control as it was done at a time dictated by, and coordinated with, the UA/CO res system consolidation.
I found the site notice the day before about the scheduled downtime was enough notice for me. I also use it mostly during the weekdays for business planning, but YMMV.