Only the author knows about his motives. Your point seems to be that the author should not have written the blog post and done a PR instead. My point is that

Only the author knows about his motives. Your point seems to be that the author should not have written the blog post and done a PR instead. My point is that whatever the authors motives are and whether he did a PR or not, his blogpost was informative to me and has value on its own.