I did not say they didn't mix metals. I mentioned brass. Brass is an alloy of copper and zinc.
I mentioned pewter. Pewter is an alloy of tin, antimony (or lead, in earlier times), copper, bismuth, and sometimes, silver.
Coins made from silver were almost always mixed with some metal, usually copper.
My point was that the way the quote from Coinquest was worded could be misleading.
Your replica is very likely pewter, which is why some silver showed in the test.
I am just trying to help you understand that your coin is a replica, and that many of them have been, and are still being, made and sold. Evidently, I am doing a poor job of it.
If you want to disagree with my assessment, that is fine.