I wouldn't take it seriously - see the other bluestar posts https://setiathome.berkeley.edu/forum_user_posts.php?userid=... - just thoughts strung together, a train of thought, lost and found again... sometimes. I like the style though. I think the comment is about the nature of ETI communication and if it always fits our expectations (like bluestar's comment clearly does not).

Makes me wonder if someone isn't pulling an elaborate prank in homage to Brin's Existence... The aliens are communicating by posting on our forums already.

I think they are trying to say that it's too difficult to distinguish noise from a real signal when we have no idea of what the underlying language or code is. I'm not really sure how that's relevant to this thread though.