Because you didn't. You're lying and I'm 100% sure of it.
For those interested, this is the bill, an absolutely monstrous document which when read on its own doesn't even convey the full extent of the changes because much of it is a series of paragraph amendments to other laws made out of context. To really understand what's being proposed, one must first understand the current state of all laws being amended, so it's really this giant document ×20 or so.
So unless it's your job to parse these documents, or you wrote it yourself, you did not read it.
I also did not read it, but at least I'm being honest about that. I did however skim through it looking for confirmations of what was mentioned in the video. What I found was enough to convince me that the video is accurate. What's more, the author has done the work of a responsible journalist: he cited his sources in the video description. Sources which were in turn written by responsible people whose literal jobs are to understand these massive changes and compile them into documents the public understand. You know, journalism.
Maybe you read the summary, which is much easier to parse, though still ridiculously long, lacking context and glazing over important details. Even in there though, there are clear mentions of allowing the opening of your mail, so if you read that and are still somehow cool with it then... well I guess it's true that we're all condemned to repeat history 'cause some people just refuse to learn.