It depends on at what price the one sold his/her bitcoins. If he/she sold at 19000 dollars, they made a huge profit and they are still not in a loss.
Made huge profit mean not loss. Not all people who sell their coin would be in loss.
All depending on how much price they buy and sell their bitcoin. Maybe you think this because bitcoin price will increase its price again but it does not mean the people is in loss just because of that..