I don't believe in that statement, if Real Madrid want to be even better next season then they have to bring in more players because this season they were left behind by some of their main players and even now there are many old players at Real Madrid whose quality has decreased.
The position of attacker and defender is Real Madrid's weak point next season and if the current transfer market does not buy the players needed in these positions, then Real Madrid's strength will not be much different from the previous season. For the midfield position they have Bellingham as a new force that can help Real Madrid and I think that position is safe for them next season.
Currently there are some rumors that say Davies still refuses a contract extension with Bayern and is waiting for an offer from Madrid which we know that Madrid also want this player and of course this could be a good thing if they intend to bring Davies from Bayern.
At the moment, the position that Mendy still has as a Left Back is still a bit risky especially with some rumors that Mendy wants to find a new adventure and last season he was also injured for quite a while so this is a special concern for Madrid.
Fran Garcia has actually arrived and can already be positioned there, but seeing the rumors and Madrid's desire to bring in Davies, it doesn't rule out the possibility that this could also happen.