Not too me though. Especially not to me if I'm trying to decide to supplement l-theanine

Right. The only N that you can draw any conclusions about is the author himself. So, why even publish it? The "results" are not applicable to anyone reading it. This is the health version of the software industry's "It works on my system!"

Publish it is quite a loaded word here. Almost every blog or post you read is from the point of view of a single person. There's nothing wrong with him putting his experience out into the world.