Gst registration for exporters of services under exemption

Hi:

Seniors / experts please clarify my doubts on this topic.  Do exporters of services who otherwise fall under the Rs. 20 lakh aggregate turnover exeption limit need to register for GST even if their total turnover of exports stay within the 20 lakh exemption limit?  Many people say many things, and I am totally confused.  According to my understanding, export of services is considered as inter-state transaction, so they were to compulsorily register for GST.  After the October 2017 notification/clarification that inter-state services need not register for GST if falling under turnover exemption limit, does it mean that exports of services are exempted from GST registration if falling under 20 lakh turnover?  Please clarify.  Thanks in advance.