You lot don't seem to understand--- wait, you just don't WANT to understand. That's the Indian mindset. This is the reason you are hated in the neighborhood. You're trying so hard to act like a rich powerful westerner, but, in reality, you are poor and have nothing to show for it. A 4-hour lockdown for a billion people, just so elitist Modi could show the world how "rich" India was. It all backfired, a 23% contraction in the first quarter after the lockdown, and thousands of suicides and death due to hunger.
Nominal GDPs use current market exchange rates - while PPP CONVERTS exchange rates between countries. India is set to drop 10.3% in 2020 and rebound 8.8% in 2021, this will be a 1.5% drop (even more than 1.5% if you consider that, at the time, India's economy will be smaller than it was in 2020).
Now, the argument you're trying to make is that "GDP is always calculated in local currencies", - this is only true for Nominal GDP because, as mentioned above, Nominal GDP isn't converted. All this means is that the nominal GDP will fluctuate a little bit. This does not mean that India will magically rise in these two years, the GDP drop will still be around 1.5% from 2020-2022.