That's just their current plan, but they usually focus on their new and younger talents more than anything else because Dortmund wants to have some income from selling players they have like Haaland and Bellingham. In fact, selling these players can help their financial situation is the first priority for Dortmund, otherwise and if they wanted to keep these young talents in their teams they could have more chance to win the Bundesliga title specially in the last season when Bayern Munich had bad situation and they could use this chance.
This has been the history of Dortmund, buying potential young players with good talent and building them into worldclass players, I described them as an economical football team, they buy this players for little fees and sell them for very huge amount of money, just like the case of sancho, halland, and currently Jude Bellingham who just moved to Real Madrid for a very huge fee, but one thing I like about them is that they're always competitive and has been very tough rivals for Bayern Munich over the years, they've developed plenty of world star and where almost close to winning the league last season but a 2-2 draw against Mainz made them lose their chance of lifting the trophy again after 11 years and Bayern unexpectedly won the trophy.
Bayern Munich have been very dominant over the years though last season seems very poor for them but they ended up lifting the trophy at the end, it's so sad that a 2-2 draw made Dortmund lose out on the trophy after i a very nice performance all through last season, this season is going to be come competitive for both team and even though Dortmund has lost a world class player in person Jude Bellingham they'll still look very tough and come out as very strong title contenders next season.