Of course you’re correct in one sense. However, science is an old word and like many others in the English language it has multiple senses. In the context I use

Of course you’re correct in one sense. However, science is an old word and like many others in the English language it has multiple senses. In the context I used it in, it means a systematic body of knowledge. I’m sure you’d agree mathematics meets that criterion. Other examples include ethics and aesthetics.