What are the Ānāpānasati Kammaṭṭhāna as Taught By Ven. Kiribathgoda Gnanananda Thero I am curious to know how Ven. Kiribathgoda Gnanananda Thero teachers Ānāpānasati. Does he follow the 16 stage instructions or perhaps something similar to the 8 step method1 or combination of both or something different with or without overlap.

NB: In answering this please make this a self contained answer without having to navigate links and audio files.



1
Anapana Sati Meditation on Breathing by Ven. Mahathera Nauyane Ariyadhamma
Mainly it is concentrating on one's breath as "l'm inhaling short, I'm exhaling short" or otherwise "I'm inhaling long, I'm exhaling short". 

This is what Lord Buddha asks us to do in the beginning. He also says this meditation isn't for everybody. This meditation isn't the only way to understand the Four Noble Truths. 

Official Website: http://mahamevnawa.lk/

Meditation Section: 
http://mahamevnawa.lk/meditation/

You can find English sessions of Sound Cloud in that website and might find English guides on meditation. 

The thero also published a book in sinhalese called É Ama Nivan Suwa Bohoo Dura Nowe (ඒ අමා නිවන් සුව බොහෝ දුර නොවේ - The Nirvana is not that far away) which explains Maha Satipattana Sutta, which contains the above form of breathing. Buddha states also to note that the breath isn't me, mine or my soul (hence the book contains it).