The original recommendation to "use Android-specific tags" was added by Robert Harvey in 2011. The example he mentions is the tag android-intent which should be preferred over the tag intent.
The recommendation to use the android-json tag has only been added recentlyadded recently, but with no further information as to why such a tag would be needed. There seem to be no good arguments for the android-json tag, so I have removed that recommendation from the tag wiki.
The "use Android-specific tags" recommendation still may need further improvements because intent is a synonym of android-intent nowadays. So if the recommendation is still valid, there should probably be a better example.