Why is it bad if the seller needs money? Isn't that the main reason for a sale?
The main reason for the sale should be that he no longer needs the item. Maybe the concern is unfounded in a house sale, since a priority notice will surely be registered and then the house actually(?) cannot be sold within the eight months.
Put differently: Someone is in desperate financial straits and offers their car for sale, a 10% down payment immediately, the car will be handed over in half a year upon payment of the remaining amount. Sensible? I admit, not everything that limps is a comparison... But the risk remains, if something happens to the house, the down payment is lost in the worst case.
ypg is right, ask questions, find out motives, explain your own concerns, get reasonable advice, find a middle ground...