He spoke carelessly, but he didn't exactly say what the author said he said. You can in fact do many things with it. Copyright doesn't care what you do if you aren't copying. That's the definition of the word.
Well, I happen to have a great deal of respect for and routinely offer my support to those who suffer from mental illnesses, so maybe find a better way to say this that doesn't denigrate disabled people.
No. It's only illegal if you republish what you scrape. Absolutely nothing prevents any company from scraping the web and using that information internally.
I think that depends how you write your web scraper. Of course the web scraper is going to load the page, just like your web browser does, which by all accounts is not an issue. What happens after the page is loaded depends on how the software is written.