I read to the end, following your suggestion. You are correct that the article's intention is to encourage natural flight behaviours with companion birds. I do wish they were slightly more forthcoming with their main idea. It was a little awkward to read and left me wondering, especially at the beginning, if they are pro clip. I think it would read better if they rearranged the whole thing, move the end to the beginning.
Yeah, it's certainly not perfect, but I like how they phrase the various arguments, the way everything is cited, and the way it addresses each point individually.
Also, pro-flight owners aren't the target audience. I've found it's most useful for people who previously clipped and are considering stopping, but are afraid it could be a mistake. It tells the reader, "I know your heart is in the right place and you love your birds and want what's best for them. But you have concerns, so let's discuss them." To me, the bit about how clipping is meant to stop flight, but not completely... so then what's the point again? That really punched me in the logic.
I dunno. There are a lot of other wonderful pro-flight articles out there that are objectively just as good or better... for some reason this one just always stuck in my mind.