When I go out to the desert on a clear day I'm getting a lot of infrared, if it blocked out normal vision I wouldn't need sunglasses (except that the glasses block UV). Perhaps what was meant is that the lens that would be needed to focus the light would block the IR and the lens for IR would block visible light. That's generally true except for near IR (NIR) but to separate NIR from visible IR a filter to do that would be used just as it is used in digital cameras.
The article implies that it works across the IR spectrum but that's enormously wide - from about 700 nm to 1 mm wavelength with ever decreasing energy in the photons.
I think that there is less information in the press release than meets the eye.