Home Depot Allure vinyl floor

We live in Arizona and almost always have low humidity. The package suggests not to use where humidity is less than 50%. I called the manufacturer and asked about that statement, the person said she had no idea, but if they put it on the instructions, you have to follow them, so we went with a real wood floor in our home. Didn't want to take the chance. I was going to buy enough to redo the Class c flooring when I did the house but didn't. Too much time and effort if that was a deal breaker for the humidity factor.