Because the "real Satoshi" as in whoever it really is despite the name, would be checking it a lot of cleaning up any evidence and purposely adding false info to maintain the facade all the time. If the IP is located where this guy lives, tada.
Right. Because Satoshi wouldn't hide his IP address. Why would he want to do that?
For precisely the same reason that he posted a BTC related article on his own website, then deleted it but actually only moved it

he's intelligent but not very careful or wise and potentially not as ultra-skilled as a person in his position has to be with modern computing and the internet, especially security and privacy.