Even till today the origin of Nepal is still ambiguous between the 'ne' muni and 'nepa' newari bhasha schools of thoughts so saying that Nepal existed back when is naive at best.

Plus "Before Nepal's emergence as a nation in the latter half of the 18th century, the designation 'Nepal' was largely applied only to the Kathmandu Valley."

As far as india existing or not we should go back to Mahabharat to look at the 'bharatbarsha' where it all took place

But yes, when I argue that bodhisatwa was attained in India, I am only trying to explain how the state of the mind of  "buddha" was born in india. Obviously it is a known fact that Siddhartha Gautam who later became known as the Buddha was born in Lumbini I never denied that