Public transport expert please help me.

Hi! My brother just started his new job at Shangri-La Kuala Lumpur, and he lives at Residensi Razakmas.

What’s the fastest way to get from Residensi Razakmas to Shangri-La Kuala Lumpur using public transport? According to Google Maps, the best route is to take Bus T400 and Bus 400, but morning traffic can be unpredictable.

Is there a better alternative?