It's to overhaul the team with young players who have yet to sign lucrative contracts but who have managed to establish themselves as regular first team players who therefore are willing to accept a lower base wage in exchange for lifelong financial security.
The attackers we are signing also fit a defined profile that seems to be stolen from basketball - we are bringing in players who can create shots for themselves. In the NBA (and especially in high-leverage end of game situations), this is the most valuable commodity by far and it seems we are attempting a similar approach in football.
There's a pretty clear use of data to identify targets - for instance, Chelsea have been poor on set pieces all year so we prioritised Badiashile who is already an elite CB aerially and also fits perfectly into the age range we are looking for. And finally and most obviously, the use of long-term deals to mitigate the impact of FFP, take advantage of the relaxed rules post-COVID, protect the club against likely missing the CL next season, and ultimately give leverage to ownership going forward is extremely smart strategically and suggests there is a long-term plan in place.