Can't you just compare the average death rate to the current death rate? Unfortunately this site has no data for India
https://ourworldindata.org/excess-mortality-covid#excess-mor...
https://ourworldindata.org/excess-mortality-covid#excess-mor...
In fact, that is even the link you shared shows. It compared the overall death rate with the official COVID numbers and proved the numbers are conservative, in US. Of course.
The figures are orders of magnitudes greater than what's reported.