I had earlier contacted Hong Kong immigration department about transiting. Here's their response;
Thank you for contacting us.
We would like to inform you that air transit/transfer services at Hong Kong International Airport (HKIA) have resumed gradually. From 15 June 2020, passengers can use HKIA for transit/transfer on flights operated by different airlines under the same air ticket, provided that the passengers have checked through at the origin port with their boarding passes printed and baggage tagged-through to the final destination. Passengers should also confirm in advance that they are able to enter the final destination. However, transit/transfer services at HKIA to and from all Mainland China destinations are currently not available. Visa is not required for Indian nationals travelling to Hong Kong for a maximum stay of up to 14 days.