So I too am looking at visiting India (as of Dec 22, 2022, they re-instated the 2% random testing).

https://www.mohfw.gov.in/
The following protocol post arrival shall also be followed: a) A sub-section (2% of the total passengers* in the flight) shall undergo random post arrival testing at the airport on arrival. b) Such travellers in each flight shall be identified by the concerned airlines (preferably from different countries). They will submit the samples and shall be allowed to leave the airport thereafter. c) If such travellers’ samples are tested positive, their samples should be further sent for genomic testing at INSACOG laboratory network. d) They shall be treated/isolated as per laid down standard protocol.

Since they are attempting to choose visitors from different countries, I'm guessing our testing chances are greater than 2% (as a large majority of the plane is likely to be Indian). They do say we can leave airport thereafter. So what happens if we are tested and leave and the test comes back positive while we are traveling around India? Are we to report to some mandated govt health facility for quarantine? Anyone have any experience here?