You don't? Was pretty widely discussed at the time...
He also admitted (several times) to mistakes about service center number and location-- though his specific promises about fixing them and covering "all regions of NA (not just big cities) within 3 to 6 months." haven't actually happened 4 years later.
That would make things worse based on his assumptions. He's capping demand and saying unless china sales go way up there'd be no buyers for the extra cars.... that's why he "doubled" non-china deliveries seemingly thinking that'd knock out 100% of backlog and there's no more demand beyond that.
There is, of course, SOME limit to demand for vehicles in this price class- but the idea previous #s plus existing backlog (which is a # he's also kinda guessing at) is exactly it is... a guess at best.