Absolutely right. The site also forgets to mention that crossing France by train is also often even faster than doing it by plane.
Sure, the actual high speed travel part is faster on a plane but :
- train stations are usually inside the city so you don't need to add 30-60 minutes to your travel just to go to them, not to mention the same amount of time after landing. - you can arrive at the train station 5-10 minutes before the train leaves. - once the train stops, you can just disembark in a couple of minutes. You don't have to wait for a bridge to be deployed and everybody in front of you to get up.
On top of that, you have way more space in a TGV than any plane, a nice view of the country and even wifi.
I lived and worked in the South coast of France for a couple of years while my family lives in the North of the country.
Each time I had to visit, I just took a train. It was a way better experience.