Ghee, specifically. Although there are plenty of vegan substitutes

Their statement is probably incorrect. This says that 39% of India's population is "vegetarian" (with the definition left to the respondent): https://www.pewresearch.org/short-reads/2021/07/08/eight-in-ten-indians-limit-meat-in-their-diets-and-four-in-ten-consider-themselves-vegetarian/

I see claims that 9% of the population is vegan, but can't find the source of that figure (on brief examination).

Four in ten people in India follow either a vegetarian or a vegan diet, according to data by a Statista Consumer Insights survey. In all other countries polled, the figure is far lower, ranging between just five percent in Mexico and 11 percent in South Africa. In the United States, six percent of respondents said that they were vegetarian and four percent said that they were vegan.