What Umbra said, and also three pages go by while I try to write a post, ugh.
I am just going to add in my opinion as this does not look to be ending anytime soon.
I saw no problem with Satoshi knowing about the symbiote in itself, but picking it out as quickly as he did was vastly inplausible, had he waited a post or two, or showed more of the thought process that led him to that conclusion it would have been more believable.
So no, him knowing about the symbiote was not meta at all, him realizing almost instantly was, but only a little, this was so minor an infraction as to be in truth unworthy of bringing up seriously but ended up as a multi page argument that keeps getting brought back up.
There was a small amount of meta, but there is a little bit of that in virtually every character anyway. Certainly not enough to come close to justifying this enormous clusterfuck.