Sorry, there were some typo's. Here's the correct path. Also fixed it in the guide.
sudo chmod 755 /usr/libexec/airportd
sudo chown 0:0 /usr/libexec/airportd
xattr -d com.apple.quarantine /usr/libexec/airportd
As for the battery, what's the issue? It the battery not showing or status is wrong or only seeing an X?
If you're seeing an X, try booting with -f to see if that fixes it. If so, then run myHack->myfix (quick), it usually is a caching issue.