Don't you have to contrast these figures with import and export of produce, and environmental/ecological factors? Technology is one thing, but increasing yields by wasting resources (e.g. water, phosphorous, soil erosion, ...) may increase nominal productivity, but not efficiency. Not saying the conclusion is wrong, but I think your numbers are not necessarily causally linked to productivity/efficiency. I mean, the US also has a declining domestic fabrication percentage, but that's not merely indicative of productivity, but mostly outsourcing/loss of capabilities, I think.

Anyway, apparently India also doesn't score very well for food self-sufficiency: https://www.nature.com/articles/s43016-025-01173-4