Why?This is awesome news. Give Lauri a month off
If next 2 seasons ( 2023-2024 and 2024-2025 ) are more tanking than winning Lauri walks out for free summer 2025.
24 months ( 2 years ) is not plenty of time and that will run out fast.
Of course Ainge can trade Lauri at some point if it looks that he's going to test 2025 UFA free-agency that way Lauri will not walk out for free.