He may have been, but they have several products and what he was showing is the detergent booster, I believe (linked below), and not the machine cleaner which is used periodically (which is just a stronger form of it that you run without dishes in, and comes in little packets - great for cleaning hard water marks from toilets!)

https://lemishine.com/products/dish-detergent-booster

I actually just looked at the new packaging, and it does say to avoid painted things. It definitely didn’t used to.