Let me explain it to you how it works mate:
When Paypal says they will not charge a fee for withdrawal, it means you can withdraw your funds for free.
What your talking about is the conversion rate. Paypal always offers 1.5 to 2 Rupees lesser than the actual rate. This is not now but existed since years.
Earlier on once your conversion happened and the amount in rupees was less than 7K, they used to charge an additional fee of Rs 50. for the withdrawal to bank. Now that additional fee of Rs. 50 has been scrapped off.
So the lesser amount you receive after conversion has always been there in the past.