But an internationally recognized text like Brahmasputha Siddhanta cannot be faked.It laid down rules of number system , and foundation for Algebra, which are used all over the world, even today.
Also Mohd. Al-Fazari, an Arab muslim (circa 780AD AD) translated Brahmasputha Siddhanta into Arabic. Are you saying that Al-Fazari was a liar?
Or you want to say that Buddhist inscriptions from 300 BC, which use Hindu numerals, does not exist? Or Kannada language which uses decimal notations does not exist?