There's a difference between optimistically saying "Everyone is going to want our super expensive juice maker!" versus telling investors that you have built 1,0

There's a difference between optimistically saying "Everyone is going to want our super expensive juice maker!" versus telling investors that you have built 1,000 functional juice makers when in fact the juice makers don't work. The former is an optimistic projection of demand. It's not a lie if it turns out not to be true, since it's a prediction. The latter is a lie: it's telling somebody something that is objectively and unambiguously false.