"That sort of time scale".
Is not:
"Yes that is the exact timeframe that I am promising."
It's amazing how deep people will dig and stretch a few words in what they perceive as a full legal document with all the subtext to confirm whatever it is they want it to.
The estimate was made in June 2014. It's now March 2020, almost 6 years later. Unless we're talking geological timescales - and we're not - in no wise can 3 years be taken as an approximation of 6.No digging or stretching required.
You should know by now - we should all know by now - you can't really take FD's word for anything.