vulcanization is not synonymous with curing
After making the changing discussed immediately above, I reviewed the article further and find that this confusion is more deeply imbedded in this article.  The entire first paragraph equates vulcanization with any type of curing of sulfur - which is not the case.  Curing of rubber with some process has indeed been around for long before the Europeans discoved rubber, but the term vulcanization was coined specifically to refer to the curing process that involved the addition of sulfur at high temperatures.