How do you know it was written by a human? All we can do is to believe the author.
But if you want to believe otherwise that's up to you (or perhaps you just hope it could be otherwise?). If you prefer, you can read that sentence as 'How refreshing to read intelligent, coherent thoughts in a blog post instead of the garbage we so often see nowadays.'
The sentiment is the same, it's about quality and intelligent thought, not style or provenance. Maybe one day we'll have to say intelligence rather than human, which is a fun thought. I don't feel we're close to that yet though.