I agree with that, not many people call it memory, unless it is a memory card or similar. It is however still a type of computer memory and OP is asking how to erase a file in memory, which is why I try to clear up that there is two types of memory. I edited the original post to clarify that primary memory or even more specifically RAM is what people usually call memory, and that secondary memory is often called storage.

But saying you are being pedantic but then saying something that is technically entirely incorrect is not being pedantic and simply ads to confusion.