Just a quick reminder that in the UK these websites are purely informative in nature and are not actual legislation - they are meant to summarise to the public the nature of the laws but they are not laws themselves. Another good example is the .gov website that says ebikes can have a maximum power output of 250W, while in reality the legislation around ebikes(pedelecs) says the average output measured as described in the relevant industry measuring standard over a period of 30 minutes has to average out to 250W, maximum peak output is actually unlimited. It's an example of authors of the website trying to simplify it a little bit too much so the website isn't 20 pages long. I'm not saying this page you linked is wrong - just that everything you read on there has to be taken through the lens of "this isn't actual legislative text, it's a simplified summary".

>>(for example it will not be appropriate to share any recordings on social media sites)

Again, that's not what the legislation itself says and it's not so black and white. Posting a video from your own driveway of you parking your car would be perfectly legal even if taken from your own CCTV system. Posting a video of a postie that comes to your door every day for no reason other than to identify them would be not.