Er, no. The manufacturers say "don't use", the reason they give for this advice is irrelevant when it counts, which is when you are wondering whether your insurance will cover the damage due to failure.So in theory, there is no reason not to use.
"I've never failed a ballet grading exam because I've never entered one." is true but you can't infer from it that I would pass if I did try. (Hint: I don't enter because I know I'd fail.)