Look at the Newcastle game as an example. 7 of the starting 11 either weren't here last season or didn't start for us...
Compare that to the team that lost 6-1 to Newcastle last year... Lloris, Davies, Dier, Perisic, Kane... Five players that are no longer here. Skipp and Hojbjerg in midfield...
Signing for the future has started over the last few seasons (Udogie, Sarr as examples) but neither of those two were here or were starting under the previous manager because he didn't care about rebuilding.
The rebuild started in the summer. When we got rid of half the team that blessed Poch, Mourinho, Nuno and Conte.
Naming the likes of Gil or Bentancur isn't proof that we've been in a constant rebuild. They're just signings provided to a manager because they were gettable.
In the summer, the rebuild will continue (because rebuilds aren't completed in one summer) when we'll continue to see the remnants of the previous managers squads leave. The likes of Hojbjerg, Lo Celso, Sessegnon, perhaps Richarlison etc.
And Ange starts to build HIS squad.