I think you are miss-using the term science when you mean chemistry. Science is a system, a methodology. Gunpowder was not created, originally, with science. Science is how we understand the chemistry, but they are separate. Gunpowder was created with alchemy that relied on chemistry that was unknown to the creators.Nope!
Wiki's are not source.
It is not on me to provide your proof.
Alchemy that uses real science is still science. End of
FYI, IIRC, @Paul Farquhar is a scientist, so you might not want to argue with him on this distinction