It's a bit disingenuous that the guide states that it's free, but then the second half of it is paid only, and that while there are a lot of citations, especial

It's a bit disingenuous that the guide states that it's free, but then the second half of it is paid only, and that while there are a lot of citations, especially in the second part of the guide, the author isn't really in a place to explain to someone how to gain muscle except for some personal experience (1 year of research, and some time weight lifting) and instead must make an appeal on the basis of accomplishments, which basically just makes this like "another blogger's personal journey to weightlifting and so can you", albeit with some scientific research to back it up. The thing I would worry about the most is that the guide is made to seem better than others because it has some cited studies, but who's to say that those studies are statistically valid (which is somewhat hard to come by in the field of nutrition and fitness) or that the author didn't pick certain articles to back certain points and pick others to back others?