This doesn't make any functional change, LP doesn't use any of the remapped Material APIs. It only saves on the amount of remapping CB tries to perform when loading the plugin.
1) The behaviour of online player lookups is unchanged - this only affects offline player data lookups.
2) If a 'offline player' request is made from an async task, it is executed normally. (the data is loaded)
3) If a 'offline player' request that cannot be immediately fulfilled is made from the main server thread, an exception is thrown.
The exception thrown as a result of 3) can be disabled in the config. In this case, the query is performed anyway. The main server thread will block until the request is complete.