You forgot to mention that the 700-1100ms pulse interval isn't a tolerance, it's a range; the pulse interval is varied to encode the depth of the transmitter. The chance of it being precisely, and consistently, 1s is therefore remote, and readily distinguished from an aviation ULB.
True, but I wasn't meaning to suggest that it was this
particular model; it was just an example of the kind of technology that was out there. The basic model (for example) comes with a factory set pulse interval and frequency (between 34 and 50kHz).