Im pretty sure by method of deduction that he was meaning that there is no way it is too big. Otherwise, whose question is he answering?
The question isn't "would you get a 17" MBP?" in the poll. The question is "is the 17" MBP too big?"
So him saying "No way, the 17 is too big" doesn't really fit anywhere technically.
Unless maybe he is responding to the greater whole somehow.
Perhaps he might have been too lazy to add a comma as well as is customary to have a simple run on phrase response.
In a way it could go either way, but if I had to hedge my bets, I would place them on the fact he was saying that they are definitely not too big. (As would be the correct choice anyway)