Pretty much any non-powered speakers with non-cardboard cones are going to be "weatherproof-ish", which is what most people are looking for. You could stick these out on your patio as-is, and they'd be find for a year or so. Moisture would get in (as would insects and debris), but it would take a while for it to screw up the wires or drivers. You'd get your $19 worth before they shit the bed. There are quite a few decent reviews from people who got what they expected, because for $19, they weren't expecting much.

As for being actually waterproof, very few speakers actually are. They never should have used that term, as it's a blatant lie.