Well, he's not wrong about the planning situation being a nightmare. Takes too long and NIMBY's have too much power.
If you're proposing the size of development that he was, planning shouldn't be rushed and impact studies should be taken into account. If you're proposing the size of development that he was, you also don't hire cowboys or announce anything until you're absolutely sure you know what you're doing. You don't announce anything until you've surveyed the land, made sure it's fit for purpose and taken the temperature of the people who live in that area.
People should absolutely have a right to reject the construction of a theme park in their immediate vicinity, or voice their concerns about it, that's the whole point of living in a liberal democracy. He went about everything the wrong way, which is why he didn't have the support, especially compared with how Universal have handled their proposed development.
DCMS are the sponsor organisation for the proposed Universal development. MHCLG will handle the planning proposals centrally, through an SPO. DLUHC will carry out a public consultation before any planning permission is given, but once everything is signed off Universal will not have to necessarily run every small, or big, thing through the planning system again. The current stall in the programme is just how much Universal want the government to pay / do to connect their park and support it with essential infrastructure. Once these negotiations are out of the way, Universal will make a decision and an announcement about it they're going to progress. The public consultation will begin after, along with environmental impact studies, and then a decision on planning will be made.
I agree that planning can appear restrictive, especially for things we need like housing, hospitals, schools or other essential services. I don't think that planning for leisure attractions should necessarily be as much of a walk in the park as he wants them to be.