Only among women there will be this playoff, it is a competition created to avoid Canada or even USA missing the Olympics, if they had faced each other at semifinal.
Among Men, and are qualified. I have seen it a while ago, and I've even commented it somewhere. My guess is: It is a mistake from Fifa in the qualification document, they should mention the Playoff between AFC and CAF for the 0.5 quota
I've seen that they added this explanation below the table in the document, but it is also a new update, because I can't remember seeing that on the previous one.