Generally decent advice. I like my privacy and I use handles everywhere I can, I've even worked remotely and the employer didn't know my real name until they had to send the first paycheck :)
The reasoning in the article seems weak tho. I would guess the author is lashing out after a bad interview or something.
It depends on what you do. If your identity and participation in public activities is integral to why you're hired, you don't really have an option to keep everything private. Personally, I decided long ago that if I'm not comfortable saying or doing something using my true name, I probably don't need to say or do it. Yes, that's a somewhat privileged position to be in but nonetheless it's the case for me.
The reasoning in the article seems weak tho. I would guess the author is lashing out after a bad interview or something.