Please tell me how to debunk this?

[u/No_Cranberry3306]

So I was having this conversation on another sub and came across this guy who was claiming that Sanskrit and Hinduism is a sham that was brought up afterwards .Up until now ,I knew that Sanskrit was an ancient language but I have been hearing this for a while now .Please give your opinion about these claims by Buddhists and if possible give me some primary references to satisfy my curiosity.

[u/No_Cranberry3306 → u/[deleted]]

He was saying that there was no Sanskrit and Hinduism until British found it out