First of all welcome to in our community Secondly I said 1000 words articles can be rank in search engine with ease but it is not essential or a part of Seo. That was just a trick experienced by us. So that is why we shared empirical tips with our readers and viewers.
I know very well, it is not possible to write 1000 words for each product even some products have less than 300 words, that was my saying only for blogging and news magazine sites not for ecommerce. If your ecommerce site have any blog then implement this tip on that side. 150 - 300 words are fair enough for ecommerce product pages. Hope that make some sense