When one produces a number, it gives the reader an impression one has some evidence for that number. There is no evidence for a number in this case, and so we should avoid giving the false impression that we have some, and stick to quoting the number of accusations, for which we do have evidence.

If you *are* going to make up a number, the only sensible number to make up is "one". That doesn't take into account either cases where no accusation was made, or false accusations, but it's less silly than any other number one might make up.

And "ten" is a number so vast as to be utterly risible.