That is nonsense. I am not an IT professional by any means, but I am savvy enough to make my way through an OS and I still had a hard time getting Mint to work the way I needed it to without looking up a bunch of tutorials and entering in a bunch of terminal commands, something that most people would find a huge challenge.
And that doesn't even go into the problems I had installing it in the first place. And Mint is supposed to be the easiest one.
I like Linux, but suggesting it's so easy anyone can use it is ridiculous. My 82-year-old mother would not be able to figure it out very easily, nor would my 13-year-old daughter. Could they figure it out? Potentially. But easy? Definitely not.
I don't think you realize that the average computer user doesn't know much beyond how to go to their favorite websites, write email, play a few games, etc. An OS with a learning curve is not something they would find easy.