My point with that article was more that people can draw connections to it. There doesn't need to be studies in this regard when you know fasting is all about eating during a specific window and one of the behaviours of anorexia is restricting your eating as a whole.
The point is some people could take it too far, believing that they are fasting when they are ruining their bodies instead. I've had personal experience with that as I literally drove myself into a famine state because I was restricting food. Instead of losing weight, I stablized (at 215 pounds) and then I started gaining more weight shortly after because I was fasting or thinking that I was.
I know studies are important, but what I'm getting at is that people, including myself, can get mixed up into what is fasting and what is starving. People might not be able to distinguish what either is and fall into anorexia all because they saw some guy push the idea that this is the gateway to everyone's problems.
Again, I refer back to some of the eating habits that grocery store magazines encourage women to eat nothing but cabbage soup in order to trim off 40 pounds in a few months. The fasting movement as a whole kinda echoes that same sentiment though it's directed towards men now, even though it's using the same tropes as those magazines for women. It's just not getting much pushback because men are saying it's more of a "productivity solution" rather than "a health solution"
I appreciate the corrections and the conversation regardless as it's been enlightening for me despite the circumstances as well. This helps me a lot in understanding the health world and its complexities.