This is equally science as going into the woods, picking some berries and roots, grinding them and put them up your nose, doing an antibody test, and writing your conclusions up in a blog post. There's no difference.
(But, yes, I think that writing hypotheses with 100% falsifiability, before challenging them practically, is quite a good definition of "scientific method", based on Karl Popper's work. You can compare with what Wikipedia has to say.)
Edited to respond to your edit: The word falsifiability is deliberately used to distinguish that we are talking about False, the Boolean state. The confounding factors are important - the confounding factors here mean I can't prove it False; there are no circumstances whereby the author has to accept that their hypothesis was False.