India has one of the most agrarian populations in the world, with a comparatively high prevalence of subsistence farming too. Its GDP per capita is maybe a tenth of Japan's.
One million is hyperbole, but Japan's more advanced economy and lower population vs India's less advanced economy and higher population is a strange comparison in some ways. The single number doesn't tell the whole story.
So you're basically talking about HDI. That's one metric. But I think equally important is also to consider the rote tech capabilities. That India still has a lot of people practicing susbistence farming and that China still has people living in caves, and that the US still has many homeless people living in tents, ... , all those aren't indicative of the rote tech capabilies of those respective countries.
One million is hyperbole, but Japan's more advanced economy and lower population vs India's less advanced economy and higher population is a strange comparison in some ways. The single number doesn't tell the whole story.