I'm not sure on special computer guessing he means less possibility of security issues. For example if you really want a paper wallet without worry you can go all the way to starting with clean OS and updating it, get anti-virus/anti-malware software and update, then make a wallet.
I have computers I play with that even though it sounds like a lot as long as you don't mind blowing away computer not that bad. And it provides a much more secure computer then one that's been surfing the web/downloads.
Hardware wallets done properly are easier in my mind. But paper wallets are free so many love them as hard to beat the price.