The difference is that explosion proof camera has to be well sealed to contain any explosion originating within its housing and prevent sparks from within its housing from igniting vapors, gases, dust, or fibers in the air surrounding it.
Whereas the intrinsically safe means that the probe is made using the materials which limit energy electrical and thermal, to a level below that required to ignite a specific hazardous atmospheric mixture. This specific camera is not intrinsically safe, it is rated MIL-STD-810G in explosive atmosphere.