Barcelona management could recruit any player in the transfer window, but by going into debt to the player parent club, this is also what many other clubs do. Apart from that, another way is to release the players they have, especially young players who are on the rise like Lamine Yamal, this will provide extra profits to the club. In my opinion, Barcelona is still trying to get out of a difficult situation, by taking advantage of various player transfer possibilities. Management also tried to cut the club's expenses by reducing player salaries, this was forced to do because there were not many other options.
Selling potential young players is not the right way, in fact Barcelona management continues to make efforts to bring in other quality players so this is proof that Barcelona management is serious enough in building this team even though it is in a downturn.
Barcelona is currently trying to sell several players who do not have a sacred/important role in the squad in order to bring in quality players, that is quite the right step to take compared to having to sell potential young players like Yamal, I think that is a very bad thing and not will occur.