Not necessarily, They might still be in negotiations and the next thing we hear is the SDO being lodged with the government.
The budget is the government setting out how they’re going to accrue money and spend it yes but they won’t outright say “we need x amount of money for infrastructure improvements in Bedford for a theme park” because A) It looks tone deaf asking people to get ready for painful austerity like cuts so you can build a theme park and B) If they’re still in negotiations it shows their hand we already know in an ideal world they’d like to have announced it by now which tells you they want to make it work but they don’t want to be the equivalent of Florida agreeing to all of Walt Disney’s demands when he built WDW and Reedy Creek was setup as it wouldn’t be financially in their best interest.