I think the poster is suggesting you get your facts from the many credible sources of information published by experts that are available to everyone online. There are mountains of research and statistics created by professionals in various fields and they're quite easy to find. ChatGPT can usually give you a starting point and some suggested links to read or you can just use Google.
Often the media narrative we're being fed is very different to what the actual data tells us, to the extent that even I, someone with a degree in economics, have come to believe things that just aren't true because they were said so many times by so many people in authority and nobody in the media was doing their job and challenging the assertions made (so I hadn't even realised it was something I even needed to check - I check more or less everything now!). I was shocked to find out some things weren't true.
For example, the welfare bill isn't rising - it's been steady for the last 5 decades or so if you look at it as a percentage of GDP (national income). Which isn't to say that some parts of it aren't going up, but given that other parts are going down by an amount that balances this out, overall there has actually been no change. And ADHD diagnosis rates, as has been pointed out upthread, are still incredible low. They have only increased so dramatically because diagnoses for adult women were virtually zero until recently and because until relatively recently it wasn't even seen as something that adults could have at all. People with agendas are very good at spinning a narrative that just isn't true so checking these things for yourself can actually be quite fascinating!
That said, it is interesting to hear reports from teachers and professionals working on the frontline (even if anecdotal). It does sound like something is going on but it's definitely not all ADHD.