I believe they say the linings are waterproof, not the boot.
Anyhoo................. I got new boots and used "Cabelas Silicone Boot Dressing" for the first time. Had excellent results. I hunt the Rockies and you walk in streams, wet grass, snow, etc and had zero wet feet. It is a liquid too and easy to apply. Make sure you do sewn seams 2-3 times, lots of leaks there.