Didn’t the surveys indicate a brexit as a pretty big regret once people understood what it meant?

Sure, when you frame the question as, "do you support these measures to ensure children don't have access to pornography?", of course people are going to support it.

Present evidence that the new laws will be a danger to their fundamental rights and maybe you won't get quite as much support.

Also, that survey shows that there's broad support even though the same people don't believe the new laws will be effective. So... that's pretty stupid.