It's closed season, so a lot of work that would have been intended as a "surprise" will be happening now.
Over the past few years we've seen a lot of hacks where content is leaked and then poured over meticulously, before the project is finished. John Burton, in this instance, is clearly making a comparison. They built a public viewing platform for the open season, they've released tid bits on social media and engaged in a decent marketing campaign. They've given the content creators, and worked with them, plenty to talk about and analyse.
This is the theme park equivalent of The Sun hanging outside the Doctor Who set, with a zoom lens, snapping bits and publishing photos before we've seen the final product. Borderline legal, morally questionable, done purely for the interests of selling more papers and getting more views.
Sanbrooke asked Alton Towers if he could get access to the site to film testing. He wasn't granted it. He then decided he was going to fly a drone over an active construction site and critically analyse a piece of work which isn't complete. It's very easy to be a critic, especially on the interwebs, we're all doing it now.
There are questions over whether Sanbrooke actually flew his drone within the letter of the law, he'd have had to launch it and land it on public property, and maintained a line of site with it at all times. He definitely shouldn't have flown it across an active construction site. He could have done everything that the CAA require, he could also post the flight logs online if he wanted to show he did everything right there.
John Burton is perfectly entitled to be annoyed about this, he's worked hard on a project. Sanbrooke is perfectly entitled to criticise work which hasn't been completed yet.
Burton, of course, could be talking about something else entirely and we've all gotten the wrong end of the stick.