I think they said it to mislead unkowing buyers so as not to lose sales against LVC equipped controllers, IMO. I was a victum of the same statement on my first purchase. Lipo ready should mean it has a LVC feature. Aside from this, controllers have no idea what is sending them voltage. I compare this practice to the discharge rating scam many Lipo vendors put on us.
I'm not sure if that was meant to scam anyone. It was probably meant more for noobs who think they absolutely NEED a "lipo" ESC. If anything, the description should state "lipo ready, but an external LVC highly recommended".