He's referring to the Holz product, BEATBOXERZ. brothab, Holz and the Kickport are two totally different products. The only similarity is the external appearance, but only at a distance, as both surrounds the port hold of a bass drum resonant head.
Based on my observation, the Kickport operates similarly to a ported speakerbox (read: subwoofer). The Holz product simply protects the resonant hole, as sound technicians constantly places microphones inside of the bass drum - often times something (cables or the microphone itself) snags against the resonant head, which damages (read: tears) it.