This provides evidence that being a prolific composer is not enough to make one remembered. This calls into question the author’s explanation for why Bach is remembered.

The author never suggested that writing a smaller number of compositions would make it impossible to be highly regarded or remembered. The author’s theory is just that writing a lot of compositions can make one remembered.

The author acknowledges that Bach could have written many mediocre compositions. But, the author believes that at least some were outstanding, they could allow Bach to be remembered.

We don’t need to know the exact number of compositions. We still know that he wrote more than a thousand full compositions, which is a large number.

The author never suggested that having a high ratio of outstanding works to mediocre works could never be a reason someone is remembered. The author is simply arguing that in Bach’s case, that explanation doesn’t apply.