FWIW... I suspect many obvious or "CYA" sort of statements we find these days in owners manuals, terms and conditions, and even on disposable coffee cups or fast food hot apple pies (it's HOT you know) are there because companies have to try and protect themselves from (additional) litigation or warranty claims for things that really should be the customer's problem. I too get a chuckle out of some of the statements -- generally first wondering if its some translation oddity. ...some things in Asia, like pop t-shirts and their word selection can be hilarious.
In my business days, I ended up having to do the same thing with our hardware/software/services terms some times... as customer complaints, excessive claims, or thankfully seldom litigation would occur, if we couldn't make a reasonable product or offering change, we would sometimes add terms or operational instructions to prevent or protect ourselves from the same exposure occurring again. If we had not taken that action, our costs would go up as more people took advantage of the situation (at least from our perspective), forcing our prices to then increase to every other normal and reasonable customer as we built-in and then spread costs for a growing number of odd exceptions. I suspect there is probably a story we'll never know behind most of these odd sort of statements we find in Lexus or other manuals for similar reasons.