Hi markovaid, and welcome to WebmasterWorld. I've removed your examples because the Google Forum Charter [
webmasterworld.com...] ...which you probably haven't seen because our nav link is hidden in the menu under Forum Options up top... doesn't allow citing examples of the type you're asking.
Let me say this to further explain the reason for our policy, and also to answer your question... The first example you cite is, IMO, so close to what I think Google would consider spam that it's possible that someone drawing attention to it might actually be doing so to out a competitor. We don't allow outing competitors here... and I don't think that's what you're doing... but that's how bad it is.
To further describe the example to members who haven't seen it... it's tiny, tiny type, barely legible but pretty close to unreadable, in the left navigation column below the product links. In the narrow column width, where product categories are one or two or maybe occasionally three words, there are eight words of descriptive text, in a light gray font, running down the left column for the full height of my browser window. It's not exactly hidden text, but it's so small that it couldn't possibly be useful to site visitors.
I should add that the prose is mostly cookie-cutter fluff, stuffed with keywords and obviously related text. You are right, no one wants to read that. I think you need to look at some of the really successful sites out there, and I won't cite examples but you can figure them out by searching in your niche, and see what on their category and product pages is useful to visitors.
Again, we don't allow specifics here... I used the words "widgets" and "gizmos" above to exemplify part of your post. Essentially, though, if information is not useful to visitors, then don't put it on your pages. Figure out what is useful. Be resourceful in adding relevant vocabulary that's useful.
You are right also about the outer edges or very bottom of the page... they are devalued to some extent by Google. Your information should be below the basic product ordering information, but above the footer.
I'll leave it to others to describe the kinds of content that might be important.