Its good news for all Credit card lovers. Especially, for those of us waiting to apply for the coveted Diners Club credit cards. RBI has lifted the ban on Diners Club from issuing new cards from 9th Nov, 2021. And yes, the apply link for the HDFC Diners Club credit cards is working. Best of Luck!

The link to the RBI press release is here.
RBI's press release is below:
Date: Nov 09, 2021
In view of the satisfactory compliance demonstrated by Diners Club International Ltd. with the Reserve Bank of India (RBI) circular dated April 6, 2018 on Storage of Payment System Data, the restrictions imposed, vide order dated April 23, 2021, on on-boarding of fresh domestic customers have been lifted with immediate effect.
Background
RBI had, by order dated April 23, 2021, imposed restrictions on Diners Club International Ltd. from on-boarding new domestic customers onto its card network from May 1, 2021 for non-compliance with the RBI circular dated April 6, 2018 on Storage of Payment System Data.