Why Nilesh Oak's date of Ramayana is different from mine? (Part 5 of the Yuga series)

Yuga Series: Part 5.

My replies to the following questions can be seen in this video. 

# Were people very tall in Krita Yuga and short in Kali Yuga?

# It is said that man lived for 4000 years in Krita Yuga? Is this true?

# Nilesh Oak says that the Ramayana period is 12,209 BC. Is that true? 

# He too claims to have based his derivation of the date from Valmiki Ramayana. It is different from the date I have derived. How could the same source (Valmiki Ramayana) give rise to two different dates? 

My answers to these questions can be watched here 

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