It appears that India has changed the Self Declaration Procedure? Now the exemption form is only in case of "Death in a Family".

Air Suvidha Exemption Request Form For International Arriving Passengers To India
(Applications are being accepted on behalf of the state Govt.
w.e.f 23:59 hours of 22nd Feb 2021, international arriving passengers can only apply for exemption, in case of 'Death in a Family'. It is mandatory for all international arriving passengers to upload negative RT PCR certificate while filling the self declaration form. To view latest guidelines for international arriving passengers click here.)

For all other passengers, the self declaration form can be completed before their departure. However, it can only be completed when one has their negative RT-PCR test results.

All international arriving passengers must upload RT-PCR negative certificate while filling the Self Declaration Form. Passengers arriving from UK, Europe and Middle East will have to also undergo self-paid RT PCR test on arrival at the first port of entry.

For passengers flying from the US, it might need to completed very close to the departure time as the test reports are available approximately 48 hours after the test is completed.