Reserve Bank Of India [RBI] — Linking of aadhaar card to nre savings account.

My son in law is staying in usa since last several years and he has no aadhaar card
When he opened a nre savings a/c with sbi, there was no aadhaar card. He is sending money to his old parents through this s/b account,
As per your latest guidelines, all s/b a/cs have to be linked with aadhaar card by december, 2017.
However, he will be visiting india, probably in march, 2018.
Kindly intimate whether operation in the s/b a/c will be ceased after december.2017 or there will be relaxation in nre a/cs.
As will be staying for two weeks only, it may be difficult for him to enroll himself for aadhaar card, as it is generally done in a camp organised by banks or other govt, agencies. Kindly advise what to do in such eventuality.