All trading remains normal on NSE.
Media in hurry covered this news absolutely wrong creating panic for all. NSE not allowed to access securities market (do their IPO) and to launch any new derivative products for the next 6 months. This is still bad news for the exchange.
Link to SEBI circular, Page 197/198
https://www.sebi.gov.in/enforcement/orders/apr-2019/order-in-the-matter-of-nse-dark-fibre_42890.html
Also an explanation from Vikram Limaye, CEO of NSE.
Another 25 min video with Vikram Limaye on Bloomberg Quint