I would guess that as long as you have "some" good players playing 30+ games a season that means you could sell them later on and make some money. It is clearly obvious that we are seeing them building some young talent but we are not sure if they are going to sell those players or not.
I think it's the financial debt that confuses people, because they should sell their players the young ones when they worth money, like they could find maybe 3 players that can go for 300+ million total at this point, maybe even more money, maybe for like 400 if they are lucky as well. That would be nearly half of the debt all gone, they could just use that money and pay the debt and open up cap space and not replace them with expensive players, just get free agents and suddenly they are back on their feet financially. But we do not know if they will do that or not.
I believe that the times have changed a lot for Barcelona because for some time they have been a really unique club and were the first address in European soccer for most of the world's best talents. Many of their top players came from their own youth and have all been among the very best. But this is different now and since all those players from this huge era are gone (like Iniesta and Messi), the success also stopped kind of. They are now not this club that everybody wants to go to and they have a harder time to convince the top players to come to them instead of Real Madrid or Manchester City.