47k in 100 countries, they say. These are $100 fully refundable 'preorders', so they're more like placeholders in line than anything else. They will absolutely have a high attrition rate because most of them are speculatory. And of small number that are serious -- how many of those are in a regulatory region where they will be launching? ...and in a way that they are normally registrable? I think even they'll be shocked to ship 10% of those preorders.
For a bit of a reality check here -- the cybertruck preorder originally had the exact same terms (before it got more expensive), and had 2 million preorders. They've sold almost 30k of them, and it has already been reported that all waitlist reservations have been fulfilled. So at best, a 98% attrition rate. If the Aptera ever ships, and they are able to convert sales as good as Tesla did with the Cybertruck -- then yeah, the number will be measured in hundreds, not thousands.
1. That's likely a high water mark estimate
2. An extra 10k is easier to come up with, not to mention generally cars in that price range going up by about 5k anyways