According to https://www.exchange4media.com/, Ravish has resigned from NDTV.

Ravish has resigned from NDTV: NDTV owners and founders Prannoy Roy and Radhika Roy have resigned as directors of RRPR Holding Pvt Ltd (RRPRH).RIP NDTV is trending on Twitter after Prannoy Roy and his wife Radhika Roy resigned from the NDTV board (RRPR)

In a filing to the Bombay Stock Exchange (BSE), the company has said that the resignation letter has come into effect from Tuesday, November 29.
Sudipta Bhattacharya, Sanjay Puglia and Senthil Sinniah Chengalvarayan have been appointed as directors on the board of RRPRH. With these appointments, the Adani Group has entered the board of NDTV. Kumar is known for his groundbreaking coverage of raw issues affecting the people of the country.
Ravish Kumar has been an integral part of NDTV for decades; his contribution has been immense and ITA Award for Best Anchor – News/Current Affairs show,ITA Award for Best News/Current Affairs Show

The resignation is effective immediately, the company said