I thought he signed the new contract to put RB in a better negotiation position with suitors, no? Since his contract was running down in 2021, he extended for that reason only, not that he wanted to stay. The inclusion of a low buyout clause for next summer sets the bar at above 42m, a price they might not have received had the contract not been extended.
I think he is absolutely available this summer, likely at a price between 42m and 60m.
If Sancho isn't coming, a loan for O. Dembele (for a reasonably low loan fee), nicking Thiago (for 30m), adding Partey/Zakaria (for 50m), and Upamencano for (50m), would be an incredible (and feasible) window.