There have been plenty of analysis of various countries mortality rates compared to normal years. In general, the trend seems to be that poorer countries have probably missed a lot of COVID deaths due to lack of testing infrastructure and heavily rural populations.
https://www.economist.com/graphic-detail/coronavirus-excess-...
For example: if a crematorium has historically dealt with 20 cremations a week and is now doing 100 a week, you can estimate that 80 people are dying from COVID per week. The estimate is likely to be pretty inaccurate, but it's the best source of information that there is.
When there's a COVID spike, most of the excess deaths are people dying of COVID (some might be people dying due to fear of COVID, or hospitals collapsing- arguably still "COVID fatalities" even if they don't test positive).
But let's be clear, inaccurate has different meanings - in this context if the official figure is 20 and it turns out that only 40 have died then that's 100% out on the official side and 50% out on the estimated side. In this context the high figure may have far more utility as well - by producing a more appropriate response from the authorities and society.
E.g. its unlikely deaths increased 100%+ across all of india due to existing death-causes.